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javascript/snippets/toggle-element.md

@@ -0,0 +1,25 @@
+---
+title: Toggle element in array
+type: snippet
+tags: [array]
+author: chalarangelo
+cover: digital-nomad-7
+dateModified: 2022-04-15T05:00:00-04:00
+---
+
+Removes an element from an array if it's included in the array, or pushes it to the array if it isn't.
+
+- Use `Array.prototype.includes()` to check if the given element is in the array.
+- Use `Array.prototype.filter()` to remove the element if it's in the array.
+- Use the spread operator (`...`) to push the element if it's not in the array.
+
+```js
+const toggleElement = (arr, val) =>
+  arr.includes(val) ? arr.filter(el => el !== val) : [...arr, val];
+
+```
+
+```js
+toggleElement([1, 2, 3], 2); // [1, 3]
+toggleElement([1, 2, 3], 4); // [1, 2, 3, 4]
+```