JS array insertAt and removeAt function

insertAt-removeAt.js

function insertAt(arr, val, i) {
    arr.splice(i, 0, val);
}
function removeAt(arr, i) {
    return arr.splice(i, 1).length === 1;
}

function genericInsertAt(arr, val, i) {
    Array.prototype.splice.call(arr, i, 0, val);
}
function genericRemoveAt(arr, i) {
    return Array.prototype.splice.call(arr, i, 1).length === 1;
}