freeCodeCamp/steamroller.english.md at d78168f7db3c4d7a568499a72b3af49be362378f

Randell Dawson d78168f7db fix(curriculum): Remove unnecessary assert message argument from English challenges JavaScript Algorithms and Data Structures - 03 (#36403 )

* fix: rm assert msg basic-data-structures

* fix: rm assert msg intermed-algo-scripting

* fix: rm assert msg data-structures projects

2019-07-24 10:56:38 +02:00

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id, title, isRequired, challengeType

id	title	isRequired	challengeType
ab306dbdcc907c7ddfc30830	Steamroller	true	5

Description

Flatten a nested array. You must account for varying levels of nesting. Remember to use Read-Search-Ask if you get stuck. Try to pair program. Write your own code.

Instructions

Tests

tests:
  - text: <code>steamrollArray([[["a"]], [["b"]]])</code> should return <code>["a", "b"]</code>.
    testString: assert.deepEqual(steamrollArray([[["a"]], [["b"]]]), ["a", "b"]);
  - text: <code>steamrollArray([1, [2], [3, [[4]]]])</code> should return <code>[1, 2, 3, 4]</code>.
    testString: assert.deepEqual(steamrollArray([1, [2], [3, [[4]]]]), [1, 2, 3, 4]);
  - text: <code>steamrollArray([1, [], [3, [[4]]]])</code> should return <code>[1, 3, 4]</code>.
    testString: assert.deepEqual(steamrollArray([1, [], [3, [[4]]]]), [1, 3, 4]);
  - text: <code>steamrollArray([1, {}, [3, [[4]]]])</code> should return <code>[1, {}, 3, 4]</code>.
    testString: assert.deepEqual(steamrollArray([1, {}, [3, [[4]]]]), [1, {}, 3, 4]);

Challenge Seed

function steamrollArray(arr) {
  // I'm a steamroller, baby
  return arr;
}

steamrollArray([1, [2], [3, [[4]]]]);

Solution

function steamrollArray(arr) {
  if (!Array.isArray(arr)) {
    return [arr];
  }
  var out = [];
  arr.forEach(function(e) {
    steamrollArray(e).forEach(function(v) {
      out.push(v);
    });
  });
  return out;
}

1.7 KiB Raw Blame History