Merging objects (associative arrays)

Question

What’s the best/standard way of merging two associative arrays in JavaScript? Does everyone just do it by rolling their own for loop?

Answer 1

Underscore also has an extend method:

Copy all of the properties in the source objects over to the destination object. It's in-order, so the last source will override properties of the same name in previous arguments.

_.extend(destination, *sources) 

_.extend({name : 'moe'}, {age : 50});
=> {name : 'moe', age : 50}