how to add a letter to a string javascript

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Juan Manuel
19 Sep 2016
1String.prototype.splice = function(idx, rem, str) {
2    return this.slice(0, idx) + str + this.slice(idx + Math.abs(rem));
3};
4
5var result = "foo baz".splice(4, 0, "bar ");
6document.body.innerHTML = result; // "foo bar baz"
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