_.isEqual reporting a difference when there is none

Question

I am trying to compare two objects using the .isEqual method from lodash-node package. Even though the objects are same, .isEqual returns false.

var _ = require('lodash-node');

var obj1 = {"properties":{"property":[{"comfort":["2.4 GHz"]},{"name":["Mosaic"]}]}};
var obj2 = {"properties":{"property":[{"name":["Mosaic"]},{"comfort":["2.4 GHz"]}]}};

if(_.isEqual(obj1, obj2)) //--> Returns false
    console.log('same')
else
    console.log('not same');

node:- v0.12.7
lodash-node:- v3.10.1

The objects look similar to me. Please help in pointing out if there is any difference.

Answer 1

I realise this doesn't apply in your example but I found another case where lodash returns not equal for objects where JSON.stringify returns the same string.

In my case, one object had a property with the value undefined whereas the other object did not have that property at all.

Personally, I'd argue lodash is incorrect in this case but it's a bit subjective.

Answer 2

The objects are not equal since even when deep-comparing, an array is an ordered collection, and order matters. Your array holds the same values, but not at the same order.

Answer 3

The order in an array matters, so

_.isEqual([1,2], [2, 1]) === false

which is why your example returns false.