Improve formatting of docs

master
Magnar Sveen 13 years ago
parent 1812a1790b
commit 23ab7265d2
  1. 188
      README.md
  2. 8
      dev/examples-to-docs.el
  3. 2
      readme-template.md

@ -188,10 +188,10 @@ of course the original can also be written like
which demonstrates the usefulness of both versions. which demonstrates the usefulness of both versions.
## Documentation and examples
## List to list
### -map `(fn list)` #### -map `(fn list)`
Returns a new list consisting of the result of applying `fn` to the items in `list`. Returns a new list consisting of the result of applying `fn` to the items in `list`.
@ -201,7 +201,7 @@ Returns a new list consisting of the result of applying `fn` to the items in `li
(--map (* it it) '(1 2 3 4)) ;; => '(1 4 9 16) (--map (* it it) '(1 2 3 4)) ;; => '(1 4 9 16)
``` ```
### -filter `(pred list)` #### -filter `(pred list)`
Returns a new list of the items in `list` for which `pred` returns a non-nil value. Returns a new list of the items in `list` for which `pred` returns a non-nil value.
@ -213,7 +213,7 @@ Alias: `-select`
(--filter (= 0 (% it 2)) '(1 2 3 4)) ;; => '(2 4) (--filter (= 0 (% it 2)) '(1 2 3 4)) ;; => '(2 4)
``` ```
### -remove `(pred list)` #### -remove `(pred list)`
Returns a new list of the items in `list` for which `pred` returns nil. Returns a new list of the items in `list` for which `pred` returns nil.
@ -225,7 +225,7 @@ Alias: `-reject`
(--remove (= 0 (% it 2)) '(1 2 3 4)) ;; => '(1 3) (--remove (= 0 (% it 2)) '(1 2 3 4)) ;; => '(1 3)
``` ```
### -keep `(fn list)` #### -keep `(fn list)`
Returns a new list of the non-nil results of applying `fn` to the items in `list`. Returns a new list of the non-nil results of applying `fn` to the items in `list`.
@ -235,7 +235,7 @@ Returns a new list of the non-nil results of applying `fn` to the items in `list
(--keep (when (> it 3) (* 10 it)) '(1 2 3 4 5 6)) ;; => '(40 50 60) (--keep (when (> it 3) (* 10 it)) '(1 2 3 4 5 6)) ;; => '(40 50 60)
``` ```
### -map-when `(pred rep list)` #### -map-when `(pred rep list)`
Returns a new list where the elements in `list` that does not match the `pred` function Returns a new list where the elements in `list` that does not match the `pred` function
are unchanged, and where the elements in `list` that do match the `pred` function are mapped are unchanged, and where the elements in `list` that do match the `pred` function are mapped
@ -247,7 +247,7 @@ through the `rep` function.
(--map-when (= it 2) 17 '(1 2 3 4)) ;; => '(1 17 3 4) (--map-when (= it 2) 17 '(1 2 3 4)) ;; => '(1 17 3 4)
``` ```
### -map-indexed `(fn list)` #### -map-indexed `(fn list)`
Returns a new list consisting of the result of (`fn` index item) for each item in `list`. Returns a new list consisting of the result of (`fn` index item) for each item in `list`.
@ -258,7 +258,7 @@ In the anaphoric form `--map-indexed`, the index is exposed as `it-index`.
(--map-indexed (- it it-index) '(1 2 3 4)) ;; => '(1 1 1 1) (--map-indexed (- it it-index) '(1 2 3 4)) ;; => '(1 1 1 1)
``` ```
### -flatten `(l)` #### -flatten `(l)`
Takes a nested list `l` and returns its contents as a single, flat list. Takes a nested list `l` and returns its contents as a single, flat list.
@ -268,7 +268,7 @@ Takes a nested list `l` and returns its contents as a single, flat list.
(-flatten '(1 2 (3 . 4))) ;; => '(1 2 (3 . 4)) (-flatten '(1 2 (3 . 4))) ;; => '(1 2 (3 . 4))
``` ```
### -concat `(&rest lists)` #### -concat `(&rest lists)`
Returns a new list with the concatenation of the elements in the supplied `lists`. Returns a new list with the concatenation of the elements in the supplied `lists`.
@ -278,7 +278,7 @@ Returns a new list with the concatenation of the elements in the supplied `lists
(-concat '(1) '(2 3) '(4)) ;; => '(1 2 3 4) (-concat '(1) '(2 3) '(4)) ;; => '(1 2 3 4)
``` ```
### -mapcat `(fn list)` #### -mapcat `(fn list)`
Returns the concatenation of the result of mapping `fn` over `list`. Returns the concatenation of the result of mapping `fn` over `list`.
Thus function `fn` should return a list. Thus function `fn` should return a list.
@ -289,7 +289,7 @@ Thus function `fn` should return a list.
(--mapcat (list 0 it) '(1 2 3)) ;; => '(0 1 0 2 0 3) (--mapcat (list 0 it) '(1 2 3)) ;; => '(0 1 0 2 0 3)
``` ```
### -slice `(list from &optional to)` #### -slice `(list from &optional to)`
Return copy of `list`, starting from index `from` to index `to`. Return copy of `list`, starting from index `from` to index `to`.
`from` or `to` may be negative. `from` or `to` may be negative.
@ -300,7 +300,7 @@ Return copy of `list`, starting from index `from` to index `to`.
(-slice '(1 2 3 4 5) 1 -1) ;; => '(2 3 4) (-slice '(1 2 3 4 5) 1 -1) ;; => '(2 3 4)
``` ```
### -take `(n list)` #### -take `(n list)`
Returns a new list of the first `n` items in `list`, or all items if there are fewer than `n`. Returns a new list of the first `n` items in `list`, or all items if there are fewer than `n`.
@ -309,7 +309,7 @@ Returns a new list of the first `n` items in `list`, or all items if there are f
(-take 17 '(1 2 3 4 5)) ;; => '(1 2 3 4 5) (-take 17 '(1 2 3 4 5)) ;; => '(1 2 3 4 5)
``` ```
### -drop `(n list)` #### -drop `(n list)`
Returns the tail of `list` without the first `n` items. Returns the tail of `list` without the first `n` items.
@ -318,7 +318,7 @@ Returns the tail of `list` without the first `n` items.
(-drop 17 '(1 2 3 4 5)) ;; => '() (-drop 17 '(1 2 3 4 5)) ;; => '()
``` ```
### -take-while `(pred list)` #### -take-while `(pred list)`
Returns a new list of successive items from `list` while (`pred` item) returns a non-nil value. Returns a new list of successive items from `list` while (`pred` item) returns a non-nil value.
@ -328,7 +328,7 @@ Returns a new list of successive items from `list` while (`pred` item) returns a
(--take-while (< it 4) '(1 2 3 4 3 2 1)) ;; => '(1 2 3) (--take-while (< it 4) '(1 2 3 4 3 2 1)) ;; => '(1 2 3)
``` ```
### -drop-while `(pred list)` #### -drop-while `(pred list)`
Returns the tail of `list` starting from the first item for which (`pred` item) returns nil. Returns the tail of `list` starting from the first item for which (`pred` item) returns nil.
@ -338,7 +338,7 @@ Returns the tail of `list` starting from the first item for which (`pred` item)
(--drop-while (< it 4) '(1 2 3 4 3 2 1)) ;; => '(4 3 2 1) (--drop-while (< it 4) '(1 2 3 4 3 2 1)) ;; => '(4 3 2 1)
``` ```
### -rotate `(n list)` #### -rotate `(n list)`
Rotate `list` `n` places to the right. With `n` negative, rotate to the left. Rotate `list` `n` places to the right. With `n` negative, rotate to the left.
The time complexity is `o`(n). The time complexity is `o`(n).
@ -348,7 +348,7 @@ The time complexity is `o`(n).
(-rotate -3 '(1 2 3 4 5 6 7)) ;; => '(4 5 6 7 1 2 3) (-rotate -3 '(1 2 3 4 5 6 7)) ;; => '(4 5 6 7 1 2 3)
``` ```
### -insert-at `(n x list)` #### -insert-at `(n x list)`
Returns a list with `x` inserted into `list` at position `n`. Returns a list with `x` inserted into `list` at position `n`.
@ -358,7 +358,9 @@ Returns a list with `x` inserted into `list` at position `n`.
``` ```
### -reduce-from `(fn initial-value list)` ## Reductions
#### -reduce-from `(fn initial-value list)`
Returns the result of applying `fn` to `initial-value` and the Returns the result of applying `fn` to `initial-value` and the
first item in `list`, then applying `fn` to that result and the 2nd first item in `list`, then applying `fn` to that result and the 2nd
@ -374,7 +376,7 @@ exposed as `acc`.
(--reduce-from (concat acc " " it) "START" '("a" "b" "c")) ;; => "START a b c" (--reduce-from (concat acc " " it) "START" '("a" "b" "c")) ;; => "START a b c"
``` ```
### -reduce-r-from `(fn initial-value list)` #### -reduce-r-from `(fn initial-value list)`
Replace conses with `fn`, nil with `initial-value` and evaluate Replace conses with `fn`, nil with `initial-value` and evaluate
the resulting expression. If `list` is empty, `initial-value` is the resulting expression. If `list` is empty, `initial-value` is
@ -389,7 +391,7 @@ operation associates from right instead of from left.
(--reduce-r-from (concat it " " acc) "END" '("a" "b" "c")) ;; => "a b c END" (--reduce-r-from (concat it " " acc) "END" '("a" "b" "c")) ;; => "a b c END"
``` ```
### -reduce `(fn list)` #### -reduce `(fn list)`
Returns the result of applying `fn` to the first 2 items in `list`, Returns the result of applying `fn` to the first 2 items in `list`,
then applying `fn` to that result and the 3rd item, etc. If `list` then applying `fn` to that result and the 3rd item, etc. If `list`
@ -406,7 +408,7 @@ exposed as `acc`.
(--reduce (format "%s-%s" acc it) '(1 2 3)) ;; => "1-2-3" (--reduce (format "%s-%s" acc it) '(1 2 3)) ;; => "1-2-3"
``` ```
### -reduce-r `(fn list)` #### -reduce-r `(fn list)`
Replace conses with `fn` and evaluate the resulting expression. Replace conses with `fn` and evaluate the resulting expression.
The final nil is ignored. If `list` contains no items, `fn` must The final nil is ignored. If `list` contains no items, `fn` must
@ -426,7 +428,7 @@ associates from right instead of from left.
(--reduce-r (format "%s-%s" acc it) '(1 2 3)) ;; => "3-2-1" (--reduce-r (format "%s-%s" acc it) '(1 2 3)) ;; => "3-2-1"
``` ```
### -count `(pred list)` #### -count `(pred list)`
Counts the number of items in `list` where (`pred` item) is non-nil. Counts the number of items in `list` where (`pred` item) is non-nil.
@ -435,7 +437,7 @@ Counts the number of items in `list` where (`pred` item) is non-nil.
(--count (< it 4) '(1 2 3 4)) ;; => 3 (--count (< it 4) '(1 2 3 4)) ;; => 3
``` ```
### -sum `(list)` #### -sum `(list)`
Return the sum of `list`. Return the sum of `list`.
@ -445,7 +447,7 @@ Return the sum of `list`.
(-sum '(1 2 3)) ;; => 6 (-sum '(1 2 3)) ;; => 6
``` ```
### -product `(list)` #### -product `(list)`
Return the product of `list`. Return the product of `list`.
@ -455,7 +457,7 @@ Return the product of `list`.
(-product '(1 2 3)) ;; => 6 (-product '(1 2 3)) ;; => 6
``` ```
### -min `(list)` #### -min `(list)`
Return the smallest value from `list` of numbers or markers. Return the smallest value from `list` of numbers or markers.
@ -465,7 +467,7 @@ Return the smallest value from `list` of numbers or markers.
(-min '(1 2 3)) ;; => 1 (-min '(1 2 3)) ;; => 1
``` ```
### -min-by `(comparator list)` #### -min-by `(comparator list)`
Take a comparison function `comparator` and a `list` and return Take a comparison function `comparator` and a `list` and return
the least element of the list by the comparison function. the least element of the list by the comparison function.
@ -479,7 +481,7 @@ comparing them.
(--min-by (> (length it) (length other)) '((1 2 3) (1) (1 2))) ;; => '(1) (--min-by (> (length it) (length other)) '((1 2 3) (1) (1 2))) ;; => '(1)
``` ```
### -max `(list)` #### -max `(list)`
Return the largest value from `list` of numbers or markers. Return the largest value from `list` of numbers or markers.
@ -489,7 +491,7 @@ Return the largest value from `list` of numbers or markers.
(-max '(1 2 3)) ;; => 3 (-max '(1 2 3)) ;; => 3
``` ```
### -max-by `(comparator list)` #### -max-by `(comparator list)`
Take a comparison function `comparator` and a `list` and return Take a comparison function `comparator` and a `list` and return
the greatest element of the list by the comparison function. the greatest element of the list by the comparison function.
@ -504,7 +506,9 @@ comparing them.
``` ```
### -any? `(pred list)` ## Predicates
#### -any? `(pred list)`
Returns t if (`pred` x) is non-nil for any x in `list`, else nil. Returns t if (`pred` x) is non-nil for any x in `list`, else nil.
@ -516,7 +520,7 @@ Alias: `-some?`
(--any? (= 0 (% it 2)) '(1 2 3)) ;; => t (--any? (= 0 (% it 2)) '(1 2 3)) ;; => t
``` ```
### -all? `(pred list)` #### -all? `(pred list)`
Returns t if (`pred` x) is non-nil for all x in `list`, else nil. Returns t if (`pred` x) is non-nil for all x in `list`, else nil.
@ -528,7 +532,7 @@ Alias: `-every?`
(--all? (= 0 (% it 2)) '(2 4 6)) ;; => t (--all? (= 0 (% it 2)) '(2 4 6)) ;; => t
``` ```
### -none? `(pred list)` #### -none? `(pred list)`
Returns t if (`pred` x) is nil for all x in `list`, else nil. Returns t if (`pred` x) is nil for all x in `list`, else nil.
@ -538,7 +542,7 @@ Returns t if (`pred` x) is nil for all x in `list`, else nil.
(--none? (= 0 (% it 2)) '(1 2 3)) ;; => nil (--none? (= 0 (% it 2)) '(1 2 3)) ;; => nil
``` ```
### -only-some? `(pred list)` #### -only-some? `(pred list)`
Returns `t` if there is a mix of items in `list` that matches and does not match `pred`. Returns `t` if there is a mix of items in `list` that matches and does not match `pred`.
Returns `nil` both if all items match the predicate, and if none of the items match the predicate. Returns `nil` both if all items match the predicate, and if none of the items match the predicate.
@ -549,7 +553,7 @@ Returns `nil` both if all items match the predicate, and if none of the items ma
(-only-some? 'even? '(2 4 6)) ;; => nil (-only-some? 'even? '(2 4 6)) ;; => nil
``` ```
### -contains? `(list element)` #### -contains? `(list element)`
Return whether `list` contains `element`. Return whether `list` contains `element`.
The test for equality is done with `equal`, The test for equality is done with `equal`,
@ -562,7 +566,9 @@ or with `-compare-fn` if that's non-nil.
``` ```
### -split-at `(n list)` ## Partitioning
#### -split-at `(n list)`
Returns a list of ((-take `n` `list`) (-drop `n` `list`)), in no more than one pass through the list. Returns a list of ((-take `n` `list`) (-drop `n` `list`)), in no more than one pass through the list.
@ -571,7 +577,7 @@ Returns a list of ((-take `n` `list`) (-drop `n` `list`)), in no more than one p
(-split-at 17 '(1 2 3 4 5)) ;; => '((1 2 3 4 5) nil) (-split-at 17 '(1 2 3 4 5)) ;; => '((1 2 3 4 5) nil)
``` ```
### -split-with `(pred list)` #### -split-with `(pred list)`
Returns a list of ((-take-while `pred` `list`) (-drop-while `pred` `list`)), in no more than one pass through the list. Returns a list of ((-take-while `pred` `list`) (-drop-while `pred` `list`)), in no more than one pass through the list.
@ -581,7 +587,7 @@ Returns a list of ((-take-while `pred` `list`) (-drop-while `pred` `list`)), in
(--split-with (< it 4) '(1 2 3 4 3 2 1)) ;; => '((1 2 3) (4 3 2 1)) (--split-with (< it 4) '(1 2 3 4 3 2 1)) ;; => '((1 2 3) (4 3 2 1))
``` ```
### -separate `(pred list)` #### -separate `(pred list)`
Returns a list of ((-filter `pred` `list`) (-remove `pred` `list`)), in one pass through the list. Returns a list of ((-filter `pred` `list`) (-remove `pred` `list`)), in one pass through the list.
@ -591,7 +597,7 @@ Returns a list of ((-filter `pred` `list`) (-remove `pred` `list`)), in one pass
(-separate 'cdr '((1 2) (1) (1 2 3) (4))) ;; => '(((1 2) (1 2 3)) ((1) (4))) (-separate 'cdr '((1 2) (1) (1 2 3) (4))) ;; => '(((1 2) (1 2 3)) ((1) (4)))
``` ```
### -partition `(n list)` #### -partition `(n list)`
Returns a new list with the items in `list` grouped into `n-`sized sublists. Returns a new list with the items in `list` grouped into `n-`sized sublists.
If there are not enough items to make the last group `n-`sized, If there are not enough items to make the last group `n-`sized,
@ -603,7 +609,7 @@ those items are discarded.
(-partition 3 '(1 2 3 4 5 6 7)) ;; => '((1 2 3) (4 5 6)) (-partition 3 '(1 2 3 4 5 6 7)) ;; => '((1 2 3) (4 5 6))
``` ```
### -partition-all-in-steps `(n step list)` #### -partition-all-in-steps `(n step list)`
Returns a new list with the items in `list` grouped into `n-`sized sublists at offsets `step` apart. Returns a new list with the items in `list` grouped into `n-`sized sublists at offsets `step` apart.
The last groups may contain less than `n` items. The last groups may contain less than `n` items.
@ -614,7 +620,7 @@ The last groups may contain less than `n` items.
(-partition-all-in-steps 3 2 '(1 2 3 4 5)) ;; => '((1 2 3) (3 4 5) (5)) (-partition-all-in-steps 3 2 '(1 2 3 4 5)) ;; => '((1 2 3) (3 4 5) (5))
``` ```
### -partition-in-steps `(n step list)` #### -partition-in-steps `(n step list)`
Returns a new list with the items in `list` grouped into `n-`sized sublists at offsets `step` apart. Returns a new list with the items in `list` grouped into `n-`sized sublists at offsets `step` apart.
If there are not enough items to make the last group `n-`sized, If there are not enough items to make the last group `n-`sized,
@ -626,7 +632,7 @@ those items are discarded.
(-partition-in-steps 3 2 '(1 2 3 4 5)) ;; => '((1 2 3) (3 4 5)) (-partition-in-steps 3 2 '(1 2 3 4 5)) ;; => '((1 2 3) (3 4 5))
``` ```
### -partition-all `(n list)` #### -partition-all `(n list)`
Returns a new list with the items in `list` grouped into `n-`sized sublists. Returns a new list with the items in `list` grouped into `n-`sized sublists.
The last group may contain less than `n` items. The last group may contain less than `n` items.
@ -637,7 +643,7 @@ The last group may contain less than `n` items.
(-partition-all 3 '(1 2 3 4 5 6 7)) ;; => '((1 2 3) (4 5 6) (7)) (-partition-all 3 '(1 2 3 4 5 6 7)) ;; => '((1 2 3) (4 5 6) (7))
``` ```
### -partition-by `(fn list)` #### -partition-by `(fn list)`
Applies `fn` to each item in `list`, splitting it each time `fn` returns a new value. Applies `fn` to each item in `list`, splitting it each time `fn` returns a new value.
@ -647,7 +653,7 @@ Applies `fn` to each item in `list`, splitting it each time `fn` returns a new v
(--partition-by (< it 3) '(1 2 3 4 3 2 1)) ;; => '((1 2) (3 4 3) (2 1)) (--partition-by (< it 3) '(1 2 3 4 3 2 1)) ;; => '((1 2) (3 4 3) (2 1))
``` ```
### -partition-by-header `(fn list)` #### -partition-by-header `(fn list)`
Applies `fn` to the first item in `list`. That is the header Applies `fn` to the first item in `list`. That is the header
value. Applies `fn` to each item in `list`, splitting it each time value. Applies `fn` to each item in `list`, splitting it each time
@ -660,7 +666,7 @@ Applies `fn` to the first item in `list`. That is the header
(-partition-by-header 'even? '(2 1 1 1 4 1 3 5 6 6 1)) ;; => '((2 1 1 1) (4 1 3 5) (6 6 1)) (-partition-by-header 'even? '(2 1 1 1 4 1 3 5 6 6 1)) ;; => '((2 1 1 1) (4 1 3 5) (6 6 1))
``` ```
### -group-by `(fn list)` #### -group-by `(fn list)`
Separate `list` into an alist whose keys are `fn` applied to the Separate `list` into an alist whose keys are `fn` applied to the
elements of `list`. Keys are compared by `equal`. elements of `list`. Keys are compared by `equal`.
@ -672,7 +678,9 @@ elements of `list`. Keys are compared by `equal`.
``` ```
### -union `(list list2)` ## Set operations
#### -union `(list list2)`
Return a new list containing the elements of `list1` and elements of `list2` that are not in `list1`. Return a new list containing the elements of `list1` and elements of `list2` that are not in `list1`.
The test for equality is done with `equal`, The test for equality is done with `equal`,
@ -684,7 +692,7 @@ or with `-compare-fn` if that's non-nil.
(-union '(1 1 2 2) '(3 2 1)) ;; => '(1 1 2 2 3) (-union '(1 1 2 2) '(3 2 1)) ;; => '(1 1 2 2 3)
``` ```
### -difference `(list list2)` #### -difference `(list list2)`
Return a new list with only the members of `list` that are not in `list2`. Return a new list with only the members of `list` that are not in `list2`.
The test for equality is done with `equal`, The test for equality is done with `equal`,
@ -696,7 +704,7 @@ or with `-compare-fn` if that's non-nil.
(-difference '(1 2 3 4) '(3 4 5 6)) ;; => '(1 2) (-difference '(1 2 3 4) '(3 4 5 6)) ;; => '(1 2)
``` ```
### -intersection `(list list2)` #### -intersection `(list list2)`
Return a new list containing only the elements that are members of both `list` and `list2`. Return a new list containing only the elements that are members of both `list` and `list2`.
The test for equality is done with `equal`, The test for equality is done with `equal`,
@ -708,7 +716,7 @@ or with `-compare-fn` if that's non-nil.
(-intersection '(1 2 3 4) '(3 4 5 6)) ;; => '(3 4) (-intersection '(1 2 3 4) '(3 4 5 6)) ;; => '(3 4)
``` ```
### -distinct `(list)` #### -distinct `(list)`
Return a new list with all duplicates removed. Return a new list with all duplicates removed.
The test for equality is done with `equal`, The test for equality is done with `equal`,
@ -722,7 +730,9 @@ Alias: `-uniq`
``` ```
### -repeat `(n x)` ## Other list operations
#### -repeat `(n x)`
Return a list with `x` repeated `n` times. Return a list with `x` repeated `n` times.
Returns nil if `n` is less than 1. Returns nil if `n` is less than 1.
@ -733,7 +743,7 @@ Returns nil if `n` is less than 1.
(-repeat 0 :a) ;; => nil (-repeat 0 :a) ;; => nil
``` ```
### -cons* `(&rest args)` #### -cons* `(&rest args)`
Makes a new list from the elements of `args`. Makes a new list from the elements of `args`.
@ -747,7 +757,7 @@ a dotted list.
(-cons* 1) ;; => 1 (-cons* 1) ;; => 1
``` ```
### -interpose `(sep list)` #### -interpose `(sep list)`
Returns a new list of all elements in `list` separated by `sep`. Returns a new list of all elements in `list` separated by `sep`.
@ -757,7 +767,7 @@ Returns a new list of all elements in `list` separated by `sep`.
(-interpose "-" '("a" "b" "c")) ;; => '("a" "-" "b" "-" "c") (-interpose "-" '("a" "b" "c")) ;; => '("a" "-" "b" "-" "c")
``` ```
### -interleave `(&rest lists)` #### -interleave `(&rest lists)`
Returns a new list of the first item in each list, then the second etc. Returns a new list of the first item in each list, then the second etc.
@ -767,7 +777,7 @@ Returns a new list of the first item in each list, then the second etc.
(-interleave '(1 2 3) '("a" "b")) ;; => '(1 "a" 2 "b") (-interleave '(1 2 3) '("a" "b")) ;; => '(1 "a" 2 "b")
``` ```
### -zip-with `(fn list1 list2)` #### -zip-with `(fn list1 list2)`
Zip the two lists `list1` and `list2` using a function `fn`. This Zip the two lists `list1` and `list2` using a function `fn`. This
function is applied pairwise taking as first argument element of function is applied pairwise taking as first argument element of
@ -783,7 +793,7 @@ and the elements from `list2` as `other`.
(--zip-with (concat it " and " other) '("Batman" "Jekyll") '("Robin" "Hyde")) ;; => '("Batman and Robin" "Jekyll and Hyde") (--zip-with (concat it " and " other) '("Batman" "Jekyll") '("Robin" "Hyde")) ;; => '("Batman and Robin" "Jekyll and Hyde")
``` ```
### -zip `(list1 list2)` #### -zip `(list1 list2)`
Zip the two lists together. Return the list where elements Zip the two lists together. Return the list where elements
are cons pairs with car being element from `list1` and cdr being are cons pairs with car being element from `list1` and cdr being
@ -796,7 +806,7 @@ length of the shorter one.
(-zip '(1 2 3 4) '(4 5 6)) ;; => '((1 . 4) (2 . 5) (3 . 6)) (-zip '(1 2 3 4) '(4 5 6)) ;; => '((1 . 4) (2 . 5) (3 . 6))
``` ```
### -first `(pred list)` #### -first `(pred list)`
Returns the first x in `list` where (`pred` x) is non-nil, else nil. Returns the first x in `list` where (`pred` x) is non-nil, else nil.
@ -808,7 +818,7 @@ To get the first item in the list no questions asked, use `car`.
(--first (> it 2) '(1 2 3)) ;; => 3 (--first (> it 2) '(1 2 3)) ;; => 3
``` ```
### -last `(pred list)` #### -last `(pred list)`
Return the last x in `list` where (`pred` x) is non-nil, else nil. Return the last x in `list` where (`pred` x) is non-nil, else nil.
@ -818,7 +828,7 @@ Return the last x in `list` where (`pred` x) is non-nil, else nil.
(--last (> (length it) 3) '("a" "looong" "word" "and" "short" "one")) ;; => "short" (--last (> (length it) 3) '("a" "looong" "word" "and" "short" "one")) ;; => "short"
``` ```
### -first-item `(list)` #### -first-item `(list)`
Returns the first item of `list`, or nil on an empty list. Returns the first item of `list`, or nil on an empty list.
@ -827,7 +837,7 @@ Returns the first item of `list`, or nil on an empty list.
(-first-item nil) ;; => nil (-first-item nil) ;; => nil
``` ```
### -last-item `(list)` #### -last-item `(list)`
Returns the first item of `list`, or nil on an empty list. Returns the first item of `list`, or nil on an empty list.
@ -836,7 +846,7 @@ Returns the first item of `list`, or nil on an empty list.
(-last-item nil) ;; => nil (-last-item nil) ;; => nil
``` ```
### -sort `(predicate list)` #### -sort `(predicate list)`
Sort `list`, stably, comparing elements using `predicate`. Sort `list`, stably, comparing elements using `predicate`.
Returns the sorted list. `list` is `not` modified by side effects. Returns the sorted list. `list` is `not` modified by side effects.
@ -850,7 +860,9 @@ if the first element should sort before the second.
``` ```
### -> `(x &optional form &rest more)` ## Threading macros
#### -> `(x &optional form &rest more)`
Threads the expr through the forms. Inserts `x` as the second Threads the expr through the forms. Inserts `x` as the second
item in the first form, making a list of it if it is not a list item in the first form, making a list of it if it is not a list
@ -863,7 +875,7 @@ second item in second form, etc.
(-> "Abc" (concat "def") (concat "ghi")) ;; => "Abcdefghi" (-> "Abc" (concat "def") (concat "ghi")) ;; => "Abcdefghi"
``` ```
### ->> `(x form &rest more)` #### ->> `(x form &rest more)`
Threads the expr through the forms. Inserts `x` as the last item Threads the expr through the forms. Inserts `x` as the last item
in the first form, making a list of it if it is not a list in the first form, making a list of it if it is not a list
@ -876,7 +888,7 @@ last item in second form, etc.
(->> 5 (- 8)) ;; => 3 (->> 5 (- 8)) ;; => 3
``` ```
### --> `(x form &rest more)` #### --> `(x form &rest more)`
Threads the expr through the forms. Inserts `x` at the position Threads the expr through the forms. Inserts `x` at the position
signified by the token `it` in the first form. If there are more signified by the token `it` in the first form. If there are more
@ -890,7 +902,9 @@ in in second form, etc.
``` ```
### -when-let `(var-val &rest body)` ## Binding
#### -when-let `(var-val &rest body)`
If `val` evaluates to non-nil, bind it to `var` and execute body. If `val` evaluates to non-nil, bind it to `var` and execute body.
`var-val` should be a (`var` `val`) pair. `var-val` should be a (`var` `val`) pair.
@ -901,7 +915,7 @@ If `val` evaluates to non-nil, bind it to `var` and execute body.
(--when-let (even? 3) (cat it :a)) ;; => nil (--when-let (even? 3) (cat it :a)) ;; => nil
``` ```
### -when-let* `(vars-vals &rest body)` #### -when-let* `(vars-vals &rest body)`
If all `vals` evaluate to true, bind them to their corresponding If all `vals` evaluate to true, bind them to their corresponding
`vars` and execute body. `vars-vals` should be a list of (`var` `val`) `vars` and execute body. `vars-vals` should be a list of (`var` `val`)
@ -912,7 +926,7 @@ If all `vals` evaluate to true, bind them to their corresponding
(-when-let* ((x 5) (y nil) (z 7)) (+ x y z)) ;; => nil (-when-let* ((x 5) (y nil) (z 7)) (+ x y z)) ;; => nil
``` ```
### -if-let `(var-val then &optional else)` #### -if-let `(var-val then &optional else)`
If `val` evaluates to non-nil, bind it to `var` and do `then`, If `val` evaluates to non-nil, bind it to `var` and do `then`,
otherwise do `else`. `var-val` should be a (`var` `val`) pair. otherwise do `else`. `var-val` should be a (`var` `val`) pair.
@ -922,7 +936,7 @@ otherwise do `else`. `var-val` should be a (`var` `val`) pair.
(--if-let (even? 4) it nil) ;; => t (--if-let (even? 4) it nil) ;; => t
``` ```
### -if-let* `(vars-vals then &optional else)` #### -if-let* `(vars-vals then &optional else)`
If all `vals` evaluate to true, bind them to their corresponding If all `vals` evaluate to true, bind them to their corresponding
`vars` and do `then`, otherwise do `else`. `vars-vals` should be a list `vars` and do `then`, otherwise do `else`. `vars-vals` should be a list
@ -934,7 +948,9 @@ If all `vals` evaluate to true, bind them to their corresponding
``` ```
### -each `(list fn)` ## Side-effects
#### -each `(list fn)`
Calls `fn` with every item in `list`. Returns nil, used for side-effects only. Calls `fn` with every item in `list`. Returns nil, used for side-effects only.
@ -944,7 +960,7 @@ Calls `fn` with every item in `list`. Returns nil, used for side-effects only.
(let (s) (--each '(1 2 3) (setq s (cons it s))) s) ;; => '(3 2 1) (let (s) (--each '(1 2 3) (setq s (cons it s))) s) ;; => '(3 2 1)
``` ```
### -each-while `(list pred fn)` #### -each-while `(list pred fn)`
Calls `fn` with every item in `list` while (`pred` item) is non-nil. Calls `fn` with every item in `list` while (`pred` item) is non-nil.
Returns nil, used for side-effects only. Returns nil, used for side-effects only.
@ -954,7 +970,7 @@ Returns nil, used for side-effects only.
(let (s) (--each-while '(1 2 3 4) (< it 3) (!cons it s)) s) ;; => '(2 1) (let (s) (--each-while '(1 2 3 4) (< it 3) (!cons it s)) s) ;; => '(2 1)
``` ```
### -dotimes `(num fn)` #### -dotimes `(num fn)`
Repeatedly calls `fn` (presumably for side-effects) passing in integers from 0 through n-1. Repeatedly calls `fn` (presumably for side-effects) passing in integers from 0 through n-1.
@ -964,7 +980,9 @@ Repeatedly calls `fn` (presumably for side-effects) passing in integers from 0 t
``` ```
### !cons `(car cdr)` ## Destructive operations
#### !cons `(car cdr)`
Destructive: Sets `cdr` to the cons of `car` and `cdr`. Destructive: Sets `cdr` to the cons of `car` and `cdr`.
@ -973,7 +991,7 @@ Destructive: Sets `cdr` to the cons of `car` and `cdr`.
(let ((l '(3))) (!cons 5 l) l) ;; => '(5 3) (let ((l '(3))) (!cons 5 l) l) ;; => '(5 3)
``` ```
### !cdr `(list)` #### !cdr `(list)`
Destructive: Sets `list` to the cdr of `list`. Destructive: Sets `list` to the cdr of `list`.
@ -983,8 +1001,12 @@ Destructive: Sets `list` to the cdr of `list`.
``` ```
## Function combinators
### -partial `(fn &rest args)`
These combinators require Emacs 24 for its lexical scope. So they are offered in a separate package: `dash-functional`.
#### -partial `(fn &rest args)`
Takes a function `fn` and fewer than the normal arguments to `fn`, Takes a function `fn` and fewer than the normal arguments to `fn`,
and returns a fn that takes a variable number of additional `args`. and returns a fn that takes a variable number of additional `args`.
@ -996,35 +1018,31 @@ then additional args.
(funcall (-partial '+ 5 2) 3) ;; => 10 (funcall (-partial '+ 5 2) 3) ;; => 10
``` ```
### -rpartial `(fn &rest args)` #### -rpartial `(fn &rest args)`
Takes a function `fn` and fewer than the normal arguments to `fn`, Takes a function `fn` and fewer than the normal arguments to `fn`,
and returns a fn that takes a variable number of additional `args`. and returns a fn that takes a variable number of additional `args`.
When called, the returned function calls `fn` with the additional When called, the returned function calls `fn` with the additional
args first and then `args`. args first and then `args`.
Requires Emacs 24 or higher.
```cl ```cl
(funcall (-rpartial '- 5) 8) ;; => 3 (funcall (-rpartial '- 5) 8) ;; => 3
(funcall (-rpartial '- 5 2) 10) ;; => 3 (funcall (-rpartial '- 5 2) 10) ;; => 3
``` ```
### -juxt `(&rest fns)` #### -juxt `(&rest fns)`
Takes a list of functions and returns a fn that is the Takes a list of functions and returns a fn that is the
juxtaposition of those fns. The returned fn takes a variable juxtaposition of those fns. The returned fn takes a variable
number of args, and returns a list containing the result of number of args, and returns a list containing the result of
applying each fn to the args (left-to-right). applying each fn to the args (left-to-right).
Requires Emacs 24 or higher.
```cl ```cl
(funcall (-juxt '+ '-) 3 5) ;; => '(8 -2) (funcall (-juxt '+ '-) 3 5) ;; => '(8 -2)
(-map (-juxt 'identity 'square) '(1 2 3)) ;; => '((1 1) (2 4) (3 9)) (-map (-juxt 'identity 'square) '(1 2 3)) ;; => '((1 1) (2 4) (3 9))
``` ```
### -applify `(fn)` #### -applify `(fn)`
Changes an n-arity function `fn` to a 1-arity function that Changes an n-arity function `fn` to a 1-arity function that
expects a list with n items as arguments expects a list with n items as arguments
@ -1035,7 +1053,7 @@ expects a list with n items as arguments
(funcall (-applify '<) '(3 6)) ;; => t (funcall (-applify '<) '(3 6)) ;; => t
``` ```
### -on `(operator transformer)` #### -on `(operator transformer)`
Return a function of two arguments that first applies Return a function of two arguments that first applies
`transformer` to each of them and then applies `operator` on the `transformer` to each of them and then applies `operator` on the
@ -1049,7 +1067,7 @@ In types: (b -> b -> c) -> (a -> b) -> a -> a -> c
(-min-by (-on 'string-lessp 'int-to-string) '(2 100 22)) ;; => 22 (-min-by (-on 'string-lessp 'int-to-string) '(2 100 22)) ;; => 22
``` ```
### -flip `(func)` #### -flip `(func)`
Swap the order of arguments for binary function `func`. Swap the order of arguments for binary function `func`.
@ -1061,7 +1079,7 @@ In types: (a -> b -> c) -> b -> a -> c
(-sort (-flip '<) '(4 3 6 1)) ;; => '(6 4 3 1) (-sort (-flip '<) '(4 3 6 1)) ;; => '(6 4 3 1)
``` ```
### -const `(c)` #### -const `(c)`
Return a function that returns `c` ignoring any additional arguments. Return a function that returns `c` ignoring any additional arguments.
@ -1073,7 +1091,7 @@ In types: a -> b -> a
(-sum (-map (-const 1) '("a" "b" "c" "d"))) ;; => 4 (-sum (-map (-const 1) '("a" "b" "c" "d"))) ;; => 4
``` ```
### -cut `(&rest params)` #### -cut `(&rest params)`
Take n-ary function and n arguments and specialize some of them. Take n-ary function and n arguments and specialize some of them.
Arguments denoted by <> will be left unspecialized. Arguments denoted by <> will be left unspecialized.
@ -1086,7 +1104,7 @@ See `srfi-26` for detailed description.
(-filter (-cut < <> 5) '(1 3 5 7 9)) ;; => '(1 3) (-filter (-cut < <> 5) '(1 3 5 7 9)) ;; => '(1 3)
``` ```
### -not `(pred)` #### -not `(pred)`
Take an unary predicates `pred` and return an unary predicate Take an unary predicates `pred` and return an unary predicate
that returns t if `pred` returns nil and nil if `pred` returns that returns t if `pred` returns nil and nil if `pred` returns
@ -1097,7 +1115,7 @@ non-nil.
(-filter (-not (-partial '< 4)) '(1 2 3 4 5 6 7 8)) ;; => '(1 2 3 4) (-filter (-not (-partial '< 4)) '(1 2 3 4 5 6 7 8)) ;; => '(1 2 3 4)
``` ```
### -orfn `(&rest preds)` #### -orfn `(&rest preds)`
Take list of unary predicates `preds` and return an unary Take list of unary predicates `preds` and return an unary
predicate with argument x that returns non-nil if at least one of predicate with argument x that returns non-nil if at least one of
@ -1110,7 +1128,7 @@ In types: [a -> Bool] -> a -> Bool
(funcall (-orfn 'stringp 'even?) "foo") ;; => t (funcall (-orfn 'stringp 'even?) "foo") ;; => t
``` ```
### -andfn `(&rest preds)` #### -andfn `(&rest preds)`
Take list of unary predicates `preds` and return an unary Take list of unary predicates `preds` and return an unary
predicate with argument x that returns non-nil if all of the predicate with argument x that returns non-nil if all of the

@ -61,12 +61,12 @@ FUNCTION may reference an elisp function, alias, macro or a subr."
(defun function-to-md (function) (defun function-to-md (function)
(if (stringp function) (if (stringp function)
"" (concat "\n" (s-replace "### " "## " function) "\n")
(let ((command-name (car function)) (let ((command-name (car function))
(signature (cadr function)) (signature (cadr function))
(docstring (quote-docstring (nth 2 function))) (docstring (quote-docstring (nth 2 function)))
(examples (nth 3 function))) (examples (nth 3 function)))
(format "### %s `%s`\n\n%s\n\n```cl\n%s\n```\n" (format "#### %s `%s`\n\n%s\n\n```cl\n%s\n```\n"
command-name command-name
signature signature
docstring docstring
@ -85,6 +85,10 @@ FUNCTION may reference an elisp function, alias, macro or a subr."
"-" "-"
(replace-regexp-in-string "[^a-zA-Z0-9-]+" "-" (format "%S %S" command-name signature)))) (replace-regexp-in-string "[^a-zA-Z0-9-]+" "-" (format "%S %S" command-name signature))))
(defun s-replace (old new s)
"Replaces OLD with NEW in S."
(replace-regexp-in-string (regexp-quote old) new s t t))
(defun function-summary (function) (defun function-summary (function)
(if (stringp function) (if (stringp function)
(concat "\n" function "\n") (concat "\n" function "\n")

@ -73,8 +73,6 @@ of course the original can also be written like
which demonstrates the usefulness of both versions. which demonstrates the usefulness of both versions.
## Documentation and examples
[[ function-docs ]] [[ function-docs ]]
## Contribute ## Contribute

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