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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.
const toggleElement = (arr, val) =>
arr.includes(val) ? arr.filter(el => el !== val) : [...arr, val];toggleElement([1, 2, 3], 2); // [1, 3]
toggleElement([1, 2, 3], 4); // [1, 2, 3, 4]Would you like to help us improve 30 seconds of code?Take a quick survey
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