My path to JavaScript: Refactoring fizzbuzz with Array.map and Array.join

I've just refactored the generalized version of FizzBuzz I posted about recently using Array.map and Array.join functions.

This is the version that I had before:

	var makeSubstitution = function (divisor, substitute) {
	return function substituteNumberBy(acc, number) {
	if (number % divisor == 0) {
	acc += substitute;
	}
	return acc;
	};
	};
	var substitute = function (numbers, substitutions) {
	function substituteOne (number) {
	var res = (function f(acc, remainingSubstitutions) {
	if (remainingSubstitutions.length == 0) {
	return acc;
	} else {
	acc = remainingSubstitutions[0](acc, number);
	return f(acc, remainingSubstitutions.slice(1));
	}
	}("", substitutions));
	if (res != "")
	return res;
	return String(number);
	}
	return (function f (acc, remainingNumbers) {
	if (remainingNumbers.length == 0) {
	return acc;
	} else {
	next = substituteOne(remainingNumbers[0]);
	if (remainingNumbers.length == 1) {
	return acc + next;
	} else {
	return f (acc + next + " ", remainingNumbers.slice(1));
	}
	}
	})("", numbers);
	};

view raw fizzBuzz2.js hosted with ❤ by GitHub

and this is the new version using Array.map and Array.join:

	var makeSubstitution = function (divisor, substitute) {
	return function substituteNumberBy(acc, number) {
	if (number % divisor == 0) {
	acc += substitute;
	}
	return acc;
	};
	};
	var substitute = function (numbers, substitutions) {
	function substituteOne (number) {
	var res = (function f(acc, remainingSubstitutions) {
	if (remainingSubstitutions.length == 0) {
	return acc;
	} else {
	acc = remainingSubstitutions[0](acc, number);
	return f(acc, remainingSubstitutions.slice(1));
	}
	}("", substitutions));
	if (res != "")
	return res;
	return String(number);
	}
	return numbers.map(substituteOne).join(" ");
	};

view raw fizzbuzz3.js hosted with ❤ by GitHub

Even though it was fun coding that "map+join" recursive function of the first version, the second version is much simpler and more efficient (I used jsPerf to compare the two versions, check out the comparison).

Had I known Array.map and Array.join before, I could have saved a lot of typing and thinking to "reinvent the whell" :)