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[elpa] externals/dash 6eeb692 236/439: Provide an implementation of func
From: |
Phillip Lord |
Subject: |
[elpa] externals/dash 6eeb692 236/439: Provide an implementation of function composition. |
Date: |
Tue, 04 Aug 2015 20:28:23 +0000 |
branch: externals/dash
commit 6eeb692a00c33ef3061222570f18119dc95f208e
Author: Christina Whyte <address@hidden>
Commit: Christina Whyte <address@hidden>
Provide an implementation of function composition.
---
dash-functional.el | 10 ++++++++++
dev/examples.el | 8 +++++++-
2 files changed, 17 insertions(+), 1 deletions(-)
diff --git a/dash-functional.el b/dash-functional.el
index e7f5b20..4a00720 100644
--- a/dash-functional.el
+++ b/dash-functional.el
@@ -52,6 +52,16 @@ number of args, and returns a list containing the result of
applying each fn to the args (left-to-right)."
(lambda (&rest args) (mapcar (lambda (x) (apply x args)) fns)))
+(defun -compose (&rest fns)
+ "Takes a list of functions and returns a fn that is the
+composition of those fns. The returned fn takes a variable
+number of arguments, and returns the result of applying
+each fn to the result of applying the previous fn to
+the arguments (right-to-left)."
+ (lambda (&rest args)
+ (car (-reduce-r-from (lambda (fn xs) (list (apply fn xs)))
+ args fns))))
+
(defun -applify (fn)
"Changes an n-arity function FN to a 1-arity function that
expects a list with n items as arguments"
diff --git a/dev/examples.el b/dev/examples.el
index 6c3868e..b0756dc 100644
--- a/dev/examples.el
+++ b/dev/examples.el
@@ -422,7 +422,13 @@
(defexamples -juxt
(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)))
+
+ (defexamples -compose
+ (funcall (-compose 'square '+) 2 3) => (square (+ 2 3))
+ (funcall (-compose 'identity 'square) 3) => (square 3)
+ (funcall (-compose 'square 'identity) 3) => (square 3)
+ (funcall (-compose (-compose 'not 'even?) 'square) 3) => (funcall
(-compose 'not (-compose 'even? 'square)) 3)))
(defexamples -applify
(-map (-applify '+) '((1 1 1) (1 2 3) (5 5 5))) => '(3 6 15)
- [elpa] externals/dash 4a144c6 220/439: Release 2.0.0, (continued)
- [elpa] externals/dash 4a144c6 220/439: Release 2.0.0, Phillip Lord, 2015/08/04
- [elpa] externals/dash 9b0166a 224/439: Fix terminology, Phillip Lord, 2015/08/04
- [elpa] externals/dash 6d0a8d6 225/439: Add Version and Package-Requires to files #45, Phillip Lord, 2015/08/04
- [elpa] externals/dash d365f22 222/439: Fix byte compile warnings, Phillip Lord, 2015/08/04
- [elpa] externals/dash 1812a17 226/439: Complete dash and dash-functional split, Phillip Lord, 2015/08/04
- [elpa] externals/dash f1049f1 216/439: Add dash-functional back, now dependent on dash.el, Phillip Lord, 2015/08/04
- [elpa] externals/dash 39d20f2 228/439: Release 2.0.0, Phillip Lord, 2015/08/04
- [elpa] externals/dash 81e43ad 229/439: Add -union to list of highlighted symbols., Phillip Lord, 2015/08/04
- [elpa] externals/dash 515e2d3 230/439: Use `comparator` instead of `predicate` for sort., Phillip Lord, 2015/08/04
- [elpa] externals/dash 6cc7727 234/439: Release 2.1.0, Phillip Lord, 2015/08/04
- [elpa] externals/dash 6eeb692 236/439: Provide an implementation of function composition.,
Phillip Lord <=
- [elpa] externals/dash 23ab726 227/439: Improve formatting of docs, Phillip Lord, 2015/08/04
- [elpa] externals/dash 87c8b91 232/439: Add indexing operations, Phillip Lord, 2015/08/04
- [elpa] externals/dash 1e2bd96 233/439: Merge pull request #48 from Fuco1/index-operations, Phillip Lord, 2015/08/04
- [elpa] externals/dash 5232399 238/439: Merge pull request #50 from kurisuwhyte/master, Phillip Lord, 2015/08/04
- [elpa] externals/dash 20eb331 237/439: Updates the documentation., Phillip Lord, 2015/08/04
- [elpa] externals/dash 6d43c4f 235/439: Fix switched around doc strings for -find-index/indices, Phillip Lord, 2015/08/04
- [elpa] externals/dash 13e0a35 240/439: Release 2.2.0, Phillip Lord, 2015/08/04
- [elpa] externals/dash dbcb3ef 231/439: Update README, Phillip Lord, 2015/08/04
- [elpa] externals/dash bf85b21 242/439: Change &optional branches to &rest branches in `-if-let`s, Phillip Lord, 2015/08/04
- [elpa] externals/dash 8e2422a 239/439: Add Christina Whyte (@kurisuwhyte) to list of contributors, Phillip Lord, 2015/08/04