Fastest way to compare 2 objects in js

Question

Which is the fastest way to compare 2 objects in javascript?

For example I have these 2 objects:

a = [{'name': 'john', 'age': 22}, {'name': 'mike', 'age': 23}, {'name': 'anne', 'age': 12}, {'name': 'dan', 'age': 29}, {'name': 'jane', 'age': 34}]
b = [{'name': 'john', 'age': 22}, {'name': 'anne', 'age': 12}]

Normally, I would do this:

for (var i = 0; i < a.length; i++) {
    for (var j = 0; j < b.length; j++) {
        console.log(a[i]) // => [{'name': 'john', 'age': 22}, {'name': 'anne', 'age': 12}]
    }
}

This is taking too long, is it there another way faster? Thank you for your time!

Answer 1

You can have a look at the fast-deep-equal package. Here is a performance benchmark from their README.md for your reference.

fast-deep-equal x 226,960 ops/sec ±1.55% (86 runs sampled)
nano-equal x 218,210 ops/sec ±0.79% (89 runs sampled)
shallow-equal-fuzzy x 206,762 ops/sec ±0.84% (88 runs sampled)
underscore.isEqual x 128,668 ops/sec ±0.75% (91 runs sampled)
lodash.isEqual x 44,895 ops/sec ±0.67% (85 runs sampled)
deep-equal x 51,616 ops/sec ±0.96% (90 runs sampled)
deep-eql x 28,218 ops/sec ±0.42% (85 runs sampled)
assert.deepStrictEqual x 1,777 ops/sec ±1.05% (86 runs sampled)
ramda.equals x 13,466 ops/sec ±0.82% (86 runs sampled)
The fastest is fast-deep-equal

Answer 2

I don't have enough rep to add a comment to explain Neha Mundra's answer [below] so thought I'd post instead.

let a={a:20,b:10};
let b={b:10,a:20};

console.log(Object.entries(a).sort().toString()===
            Object.entries(b).sort().toString()) //true

1. Object.entries(a) / Object.entries(b) returns the contents of the objects
2. .sort() orders them by key value (a/b), as you can see in the example the keys are reversed when declared, this will ensure they are in the same order for comparison.
3. .toString returns a string representation of the object.
4. The === operator is checking for equality of both strings.

Hope that might help someone. This can also be checked in your browsers dev console, if you're not sure what's going on.