but string doesn't have `map` method... hold my beer

string.map.js

String.prototype.map = function(predicate) {
	const arr = []
	for (var i = 0; i < this.length; i++) {
		arr.push(predicate(this.charAt(i), i))
	}
	return arr.join('')
}

// ᕕ( ᐛ )ᕗ