I try to clone an array of objects with nested objects.

Something like:

var data = [
    { id: 1, values: { a: 'a', b: 'b' } },
    { id: 2, values: { c: 'c', d: 'd' } }
];

_.Clone

With the _.clone method and the isDeep parameter at true:

var clone = _.clone(data, true);

data[1].values.d = 'x';

console.log( _.isEqual(data, clone) ); // true, clone[1].values.d == 'x'

I expected clone[1].values.d == 'd' :

If isDeep is true nested objects will also be cloned, otherwise they will be assigned by reference.

What is wrong?

_.CloneDeep

In addition, when I try with the _.cloneDeep method, I get an error:

var clone = _.cloneDeep(data);

// Uncaught TypeError: Object function u(n){return n instanceof u?n:new o(n)}
// has no method 'cloneDeep'

Why this error?

$.extend

With $.extend the clone has no reference to the original object as expected:

var clone = $.extend(true, {}, data);

console.log( _.isEqual(data, clone) ); // false, clone[1].values.d == 'd'

Thanks to Gruff Bunny and Louis' comments, I found the source of the issue.

As I use Backbone.js too, I loaded a special build of Lodash compatible with Backbone and Underscore that disables some features. In this example:

var clone = _.clone(data, true);

data[1].values.d = 'x';

with the Normal build: _.isEqual(data, clone) === false
with the Underscore build: _.isEqual(data, clone) === true

I just replaced the Underscore build with the Normal build in my Backbone application and the application is still working. So I can now use the Lodash .clone with the expected behaviour.

Edit 2018: the Underscore build doesn't seem to exist anymore. If you are reading this in 2018, you could be interested by this documentation (Backbone and Lodash).