Array.prototype.splice()
with an appropriate index and a delete count of 0
, spreading the given values to be inserted.const insertAt = (arr, i, ...v) => {
arr.splice(i + 1, 0, ...v);
return arr;
};
let myArray = [1, 2, 3, 4]; insertAt(myArray, 2, 5); // myArray = [1, 2, 3, 5, 4] let otherArray = [2, 10]; insertAt(otherArray, 0, 4, 6, 8); // otherArray = [2, 4, 6, 8, 10]
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