Rename js snippets

snippets/js/s/all-array-elements-are-truthy.md

@@ -0,0 +1,22 @@
+---
+title: Test if all array elements are truthy
+type: snippet
+language: javascript
+tags: [array]
+cover: touch-flower
+dateModified: 2020-10-18T20:24:28+03:00
+---
+
+Checks if the provided predicate function returns `true` for all elements in a collection.
+
+- Use `Array.prototype.every()` to test if all elements in the collection return `true` based on `fn`.
+- Omit the second argument, `fn`, to use `Boolean` as a default.
+
+```js
+const all = (arr, fn = Boolean) => arr.every(fn);
+```
+
+```js
+all([4, 2, 3], x => x > 1); // true
+all([1, 2, 3]); // true
+```