utils1.js

var _ = require('underscore');

function sortByWeight (arr, weightMap) {
	arr.sort(function (e1, e2) {
		var w1 = weightMap[e1];
		var w2 = weightMap[e2];
		if (_.isNumber(w1) && _.isNumber(w2)) {
			return w1 - w2;
		} else {
			return 0;
		}
	});
}

function sortByFixedOrder (arr, order) {
	var weightMap = {};
	for (var i = 0; i < order.length; i++) {
		var o = order[i];
		weightMap[o] = i;
	};
	sortByWeight(arr, weightMap);
}