test-deep-equality.js

const fe = require('fast-deep-equal');
const ne = require('nano-equal');
const de = require('deep-equal');
const assert = require('assert');

let oa = { 'a': 1, 'b': [1, { 'c': 'd' }], e: { 'a': [1, 2, '2'] } };
let ob = { 'a': 1, 'b': [1, { 'c': 'd' }], e: { 'a': [1, 2, '2'] } };

const eq = 'equal';
const neq = 'not equal';

function adeq(a, b) {
    try {
        assert.deepEqual(a, b);
        return true;
    } catch (e) {
        return false;
    }
}

function adseq(a, b) {
    try {
        assert.deepStrictEqual(a, b);
        return true;
    } catch (e) {
        return false;
    }
}

const j = JSON.stringify;
const p = JSON.parse;

function testAll(a, b, testid) {
    console.log(testid);
    // console.log(`osrc  ${j(oa)}`);
    // console.log(`odest ${j(ob)}`);
    console.log(`src   ${j(a)}`);
    console.log(`dest  ${j(b)}`);
    console.log(`assert.deepEqual       : ${adeq(a, b) ? eq : neq}`);
    console.log(`assert.deepStrictEqual : ${adseq(a, b) ? eq : neq}`);
    console.log(`deep-equal             : ${de(a, b) ? eq : neq}`);
    console.log(`nano-equal             : ${ne(a, b) ? eq : neq}`);
    console.log(`fast-equal             : ${fe(a, b) ? eq : neq}`);
}

let ta = {}, tb = {};
ta = p(j(oa))
tb = p(j(ob))
testAll(ta, tb, 'Before Change');
delete ta; delete tb;

ta = {}, tb = {};
console.log('Change  tb.b.d = 1; // this is valid js, though b is an array');
ta = p(j(oa))
tb = p(j(ob))
tb.b.d = 1;
testAll(ta, tb, 'After Change');
delete ta; delete tb;

ta = {}, tb = {};
console.log('Change  tb.b[1].d = 1;');
ta = p(j(oa))
tb = p(j(ob))
tb.b[1].c = 1;
testAll(ta, tb, 'After Change');
delete ta; delete tb;

ta = {}, tb = {};
console.log('Change  tb.b[1].d = 1;');
ta = p(j(oa))
tb = p(j(ob))
tb.b[1].d = 1;
testAll(ta, tb, 'After Change');
delete ta; delete tb;

ta = {}, tb = {};
console.log('Change  tb.b[1].d = 1;');
ta = p(j(oa))
tb = p(j(ob))
tb.b[1].d = 1;
testAll(ta, tb, 'After Change');
delete ta; delete tb;

ta = {}, tb = {};
console.log('Change  tb.b[1].d = 1;');
ta = p(j(oa))
tb = p(j(ob))
tb.b[1].d = 11;
testAll(ta, tb, 'After Change');
delete ta; delete tb;