JSTests/test262/harness/compareArray.js

// Copyright (C) 2017 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: |
    Compare the contents of two arrays
defines: [compareArray]
---*/

function compareArray(a, b) {
  if (b.length !== a.length) {
    return false;
  }

  for (var i = 0; i < a.length; i++) {
    if (!compareArray.isSameValue(b[i], a[i])) {
      return false;
    }
  }
  return true;
}

compareArray.isSameValue = function(a, b) {
  if (a === 0 && b === 0) return 1 / a === 1 / b;
  if (a !== a && b !== b) return true;

  return a === b;
};

compareArray.format = function(array) {
  return `[${array.map(String).join(', ')}]`;
};

assert.compareArray = function(actual, expected, message) {
  message  = message === undefined ? '' : message;
  assert(actual != null, `First argument shouldn't be nullish. ${message}`);
  assert(expected != null, `Second argument shouldn't be nullish. ${message}`);
  var format = compareArray.format;
  assert(
    compareArray(actual, expected),
    `Expected ${format(actual)} and ${format(expected)} to have the same contents. ${message}`
  );
};