How do you clone an array of objects using underscore?

Well, there is a trick! If clone does not “clone” nested objects, you can force it to by explicitly cloning each object inside a map call! Like this:

#!/usr/bin/env node
var _ = require('underscore');
var a = [{f: 1}, {f:5}, {f:10}];
var b = _.map(a, _.clone);       // <----
b[1].f = 55;
console.log(JSON.stringify(a));

Prints:

[{"f":1},{"f":5},{"f":10}]

Yay! a is unchanged! I can now edit b to my liking!