Modern-deep-equal NPM

Summary:

Deep equality checking (checks nested objects)
Support for modern JavaScript data structures

Usage:

const deepEq = require('modern-deep-equal')

// standard equality operators don't work for non-primitives
{'a': 1} === {'a': 1} // false, same for ==
[1, 2] === [1, 2] // false, same for ==

// the function signature is:
// deepEq(value1, value2, loose = false)

deepEq({ 'a': 1 }, { 'a': 1 }) // true

// nested values are checked
deepEq({ 'a': 1, 'b': [1, 2] }, { 'a': 1, 'b': [2, 1] }) // false

// for objects, values are compared by key
deepEq({ 'a': 1, 'b': [1, 2] }, { 'b': [1, 2], 'a': 1 }) // true

// defaults to strict equality check (using === for the primitives)
deepEq(new Set(['a', [1, 2, 3]]), new Set(['a', ['1', '2', '3']])) // false
deepEq(new Set(['a', [1, 2, 3]]), new Set(['a', ['1', '2', '3']]), true) // true

Supports:

Strict and loose equality checking modes for primitives
- === vs. == applied to values
Dates (millisecond value comparison)
Regular expressions
Errors
TypedArrays
Buffers
Nested object checking for
- POJOs (plain objects like {'a': 1})
- Arrays
- Maps
- Sets