Run results for: fast Deep Equal vs JSON.stringify Equality Comparison for large arrays of nested numbers

Test name	Executions per second
✓ fast deep equals different	40,840,224 Ops/sec
fast deep equals similar	40,833,576 Ops/sec
fast deep equals same	15,270 Ops/sec
stringify similar	989 Ops/sec
stringify different	980 Ops/sec
stringify same	931 Ops/sec

Script Preparation code:

'use strict';

// do not edit .js files directly - edit src/index.jst


  var envHasBigInt64Array = typeof BigInt64Array !== 'undefined';


window.fdeq = function equal(a, b) {
  if (a === b) return true;

  if (a && b && typeof a == 'object' && typeof b == 'object') {
    if (a.constructor !== b.constructor) return false;

    var length, i, keys;
    if (Array.isArray(a)) {
      length = a.length;
      if (length != b.length) return false;
      for (i = length; i-- !== 0;)
        if (!equal(a[i], b[i])) return false;
      return true;
    }


    if ((a instanceof Map) && (b instanceof Map)) {
      if (a.size !== b.size) return false;
      for (i of a.entries())
        if (!b.has(i[0])) return false;
      for (i of a.entries())
        if (!equal(i[1], b.get(i[0]))) return false;
      return true;
    }

    if ((a instanceof Set) && (b instanceof Set)) {
      if (a.size !== b.size) return false;
      for (i of a.entries())
        if (!b.has(i[0])) return false;
      return true;
    }

    if (ArrayBuffer.isView(a) && ArrayBuffer.isView(b)) {
      length = a.length;
      if (length != b.length) return false;
      for (i = length; i-- !== 0;)
        if (a[i] !== b[i]) return false;
      return true;
    }


    if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;
    if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();
    if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();

    keys = Object.keys(a);
    length = keys.length;
    if (length !== Object.keys(b).length) return false;

    for (i = length; i-- !== 0;)
      if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;

    for (i = length; i-- !== 0;) {
      var key = keys[i];

      if (!equal(a[key], b[key])) return false;
    }

    return true;
  }

  // true if both NaN, false otherwise
  return a!==a && b!==b;
};

window.foo = Array.from({length: 4000}, () => ([Math.random() * 40, Math.random() * 40]));
window.foo2 = JSON.parse(JSON.stringify(window.foo.slice()));
window.fox = JSON.parse(JSON.stringify(window.foo.slice(0, 3000))).concat(Array.from({length: 1000}, () => ([Math.random() * 40, Math.random() * 40])));
window.bar = Array.from({length: 4000}, () => ([Math.random() * 40, Math.random() * 40]));

Run results for: fast Deep Equal vs JSON.stringify Equality Comparison for large arrays of nested numbers

Test on deep equality checking performance

fast deep equals same

fast deep equals similar

fast deep equals different

stringify same

stringify similar

stringify different