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snippets/js/s/remove.md

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+---
+title: Remove matching elements from array
+type: snippet
+language: javascript
+tags: [array]
+cover: highlands
+dateModified: 2020-10-22T20:24:04+03:00
+---
+
+Mutates an array by removing elements for which the given function returns `false`.
+
+- Use `Array.prototype.filter()` to find array elements that return truthy values.
+- Use `Array.prototype.reduce()` to remove elements using `Array.prototype.splice()`.
+- The callback function is invoked with three arguments (value, index, array).
+
+```js
+const remove = (arr, func) =>
+  Array.isArray(arr)
+    ? arr.filter(func).reduce((acc, val) => {
+      arr.splice(arr.indexOf(val), 1);
+      return acc.concat(val);
+    }, [])
+    : [];
+```
+
+```js
+remove([1, 2, 3, 4], n => n % 2 === 0); // [2, 4]
+```