Equal-test

Benchmark created on December 18, 2025

Preparation HTML

<script>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.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;
};

function valuesChanged(value, lastSyncedValue) {
    return value.length !== lastSyncedValue.length ||
    value.some((val, i) => val !== lastSyncedValue[i]);
}

// Helper to create test arrays
function makeArray(length, fillFn) {
    const a = new Array(length);
    for (let i = 0; i < length; i++) {
        a[i] = fillFn(i);
    }
    return a;
}
var N = 1000000
var a_equal_1 = makeArray(N, function(i) { return i; });
var a_equal_2 = makeArray(N, function(i) { return i; }); // identical

var a_nonequal_1 = makeArray(N, function(i) { return i; });
var a_nonequal_2 = makeArray(N, function(i) { return (i === N - 1 ? -999999 : i); }); 
</script>

Setup

Test runner

equal(a_nonequal_1, a_nonequal_2);

valuesChanged(a_nonequal_1, a_nonequal_2);

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

• Revision 1: published on December 18, 2025