Returns an array of x random elements with the sum of X

gistfile1.js

// Returns an array of x random elements with the sum of X
function randomArray(X, max) {
	var last = -1, res = [];
	while (X > 0 && res.length < max) {
		var x = Math.ceil(Math.random()*X);
		res.push(x);
		X -= x;
		last += 1;
	}
	if (X > 0) {
		res[last] += X;
	}
	return res;
}

// Returns an array of x elements with the sum of X
// randomArray([6,6,8], 1)
function randomArray(arr, diff) {
	var X = 0;
	for (var i in arr) {
		X += arr[i];
	}
	var nbr = Math.ceil(Math.random()*(arr.length+1));
	var min = Math.min.apply(Math, arr);
	var max = Math.max.apply(Math, arr);

	var last = -1, res = [];
	while (X > 0 && res.length < nbr) {
		var x = min + Math.ceil(Math.random()*(max-min+diff)) - diff - 1;
		res.push(x);
		X -= x;
		last += 1;
	}
	if (X > 0) {
		res[last] = Math.min(res[last]+X, max+diff);
	}
	return res;
}