How to toggle an element in array using JavaScript?
You could do it without a 3rd party library, this would be more efficient, like this. (this only removes the first instance of a value if found, not multiple)
Javascript
var a = [0, 1, 2, 3, 4, 6, 7, 8, 9], b = 5, c = 6;function addOrRemove(array, value) { var index = array.indexOf(value); if (index === -1) { array.push(value); } else { array.splice(index, 1); }}console.log(a);addOrRemove(a, b);console.log(a);addOrRemove(a, c);console.log(a);Output
[0, 1, 2, 3, 4, 6, 7, 8, 9][0, 1, 2, 3, 4, 6, 7, 8, 9, 5][0, 1, 2, 3, 4, 7, 8, 9, 5] On jsfiddle
You can use the lodash function "xor":
_.xor([2, 1], [2, 3]);// => [1, 3]If you don't have an array as 2nd parameter you can simpy wrap the variable into an array
var variableToInsertOrRemove = 2;_.xor([2, 1], [variableToInsertOrRemove]);// => [1]_.xor([1, 3], [variableToInsertOrRemove]);// => [1, 2, 3]Here's the doc: https://lodash.com/docs/4.16.4#xor
For immutable state ( clone array ):
const addOrRemove = (arr, item) => arr.includes(item) ? arr.filter(i => i !== item) : [ ...arr, item ];