regress-363040-02.js

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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

//-----------------------------------------------------------------------------

var BUGNUMBER = 363040;

var summary = 'Array.prototype.reduce application in array flattening';

var actual = '';

var expect = '';

//-----------------------------------------------------------------------------

test();

//-----------------------------------------------------------------------------

function test()

  printBugNumber(BUGNUMBER);

  printStatus (summary);

  function flatten(arr)

    function op(partial, item)

      if (item instanceof Array)

        Array.prototype.push.apply(partial, flatten(item));

      else

        partial.push(item);

      return partial;

    return arr.reduce(op, []);

  expect = [1, 2, 3];

  actual = flatten([1, 2, 3]);      // [1, 2, 3]

  reportCompare(expect + '', actual + '', summary + ': ' + expect);

  expect = [1, 2, 3];

  actual = flatten([1, [2], 3]);    // [1, 2, 3]

  reportCompare(expect + '', actual + '', summary + ': ' + expect);

  expect = [2, 3];

  actual = flatten([[], 2, 3]);     // [2, 3]

  reportCompare(expect + '', actual + '', summary + ': ' + expect);

  expect = [1, 2, 3];

  actual = flatten([[1], 2, 3]);    // [1, 2, 3]

  reportCompare(expect + '', actual + '', summary + ': ' + expect);

  expect = [4];

  actual = flatten([[[[4]]]]);      // [4]

  reportCompare(expect + '', actual + '', summary + ': ' + expect);

  expect = [1, 2, 3];

  actual = flatten([1, [2, [3]]]);  // [1, 2, 3]

  reportCompare(expect + '', actual + '', summary + ': ' + expect);

  expect = [];

  actual = flatten([[[[[]]]]]);     // []

  reportCompare(expect + '', actual + '', summary + ': ' + expect);