Merge pull request #1150 from rodmoioliveira/snippets/juxt

add juxt

snippets/juxt.md

@@ -0,0 +1,26 @@
+---
+title: juxt
+tags: array,function,advanced
+---
+
+Takes several functions as argument and returns a function that is the juxtaposition of those functions.
+
+Use `Array.prototype.map()` to return a `fn` that can take a variable number of `args`.
+When `fn` is called, return an array containing the result of applying each `fn` to the `args`.
+
+```js
+const juxt = (...fns) => (...args) => [...fns].map(fn => [...args].map(fn));
+```
+
+```js
+juxt(
+  x => x + 1,
+  x => x - 1,
+  x => x * 10
+)(1, 2, 3); // [[2,3,4],[0,1,2],[10,20,30]]
+
+juxt(
+  s => s.length,
+  s => s.split(" ").join("-")
+)("30 seconds of code"); // [[18],['30-seconds-of-code']]
+```