Sort an array-like object with underscore.js

sort-array-like-object.js

var i, key, pairs,
    obj = {'4': 'alpha', '2': 'beta', '5': 'gamma', '1': 'delta', '3': 'epsilon'};

for (key in obj) {
    console.log(key + ': ' + obj[key]);
}

pairs = _.pairs(obj);
obj = _.sortBy(pairs, function (item) { return item[1]; });

for (i = 0; i < obj.length; i++) {
    console.log(obj[i][0] + ': ' + obj[i][1]);
}