branch: externals/dash
commit 386ec0a14b9c20b2444855a08db8ca55cc45065a
Author: Johan Andersson <[email protected]>
Commit: Johan Andersson <[email protected]>
Add -same-items? function.
The function returns true if both lists includes the same items, no
matter of the order of the items.
---
README.md | 13 +++++++++++++
dash.el | 14 ++++++++++++++
dev/examples.el | 9 ++++++++-
3 files changed, 35 insertions(+), 1 deletions(-)
diff --git a/README.md b/README.md
index 83ca63e..fd3c632 100644
--- a/README.md
+++ b/README.md
@@ -79,6 +79,7 @@ Include this in your emacs settings to get syntax
highlighting:
* [-none?](#-none-pred-list) `(pred list)`
* [-only-some?](#-only-some-pred-list) `(pred list)`
* [-contains?](#-contains-list-element) `(list element)`
+* [-same-items?](#-same-items-list-list2) `(list list2)`
### Partitioning
@@ -620,6 +621,18 @@ or with `-compare-fn` if that's non-nil.
(-contains? '(1 2 3) 4) ;; => nil
```
+#### -same-items? `(list list2)`
+
+Return true if `list` and `list2` has the same items.
+
+The order of the elements in the lists does not matter.
+
+```cl
+(-same-items? '(1 2 3) '(1 2 3)) ;; => t
+(-same-items? '(1 2 3) '(3 2 1)) ;; => t
+(-same-items? '(1 2 3) '(1 2 3 4)) ;; => nil
+```
+
## Partitioning
diff --git a/dash.el b/dash.el
index b999df5..ae73bf3 100644
--- a/dash.el
+++ b/dash.el
@@ -964,6 +964,18 @@ or with `-compare-fn' if that's non-nil."
(defalias '-contains-p '-contains?)
+(defun -same-items? (list list2)
+ "Return true if LIST and LIST2 has the same items.
+
+The order of the elements in the lists does not matter."
+ (let ((length-a (length list))
+ (length-b (length list2)))
+ (and
+ (= length-a length-b)
+ (= length-a (length (-intersection list list2))))))
+
+(defalias '-same-items-p '-same-items?)
+
(defun -sort (comparator list)
"Sort LIST, stably, comparing elements using COMPARATOR.
Returns the sorted list. LIST is NOT modified by side effects.
@@ -1284,6 +1296,8 @@ structure such as plist or alist."
"-difference"
"-contains?"
"-contains-p"
+ "-same-items?"
+ "-same-items-p"
"-sort"
"--sort"
"-repeat"
diff --git a/dev/examples.el b/dev/examples.el
index 792883a..f1b85bb 100644
--- a/dev/examples.el
+++ b/dev/examples.el
@@ -226,7 +226,14 @@
(-contains? '(1 2 3) 2) => t
(-contains? '(1 2 3) 4) => nil
(-contains? '() 1) => nil
- (-contains? '() '()) => nil))
+ (-contains? '() '()) => nil)
+
+ (defexamples -same-items?
+ (-same-items? '(1 2 3) '(1 2 3)) => t
+ (-same-items? '(1 2 3) '(3 2 1)) => t
+ (-same-items? '(1 2 3) '(1 2 3 4)) => nil
+ (-same-items? '((a . 1) (b . 2)) '((a . 1) (b . 2))) => t
+ (-same-items? '(1 2 3) '(2 3 1)) => t))
(def-example-group "Partitioning" nil
(defexamples -split-at
