Rename js snippets

snippets/js/s/bifurcate-array-based-on-values.md

@@ -0,0 +1,26 @@
+---
+title: Bifurcate array based on values
+type: snippet
+language: javascript
+tags: [array]
+cover: sunrise-over-mountains
+dateModified: 2020-11-01T20:50:57+02:00
+---
+
+Splits values into two groups, based on the result of the given `filter` array.
+
+- Use `Array.prototype.reduce()` and `Array.prototype.push()` to add elements to groups, based on `filter`.
+- If `filter` has a truthy value for any element, add it to the first group, otherwise add it to the second group.
+
+```js
+const bifurcate = (arr, filter) =>
+  arr.reduce((acc, val, i) => (acc[filter[i] ? 0 : 1].push(val), acc), [
+    [],
+    [],
+  ]);
+```
+
+```js
+bifurcate(['beep', 'boop', 'foo', 'bar'], [true, true, false, true]);
+// [ ['beep', 'boop', 'bar'], ['foo'] ]
+```