77 lines
2.1 KiB
Markdown
77 lines
2.1 KiB
Markdown
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---
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id: ab306dbdcc907c7ddfc30830
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title: Steamroller
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isRequired: true
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challengeType: 5
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---
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## Description
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<section id='description'>
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Flatten a nested array. You must account for varying levels of nesting.
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Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514' target='_blank'>Read-Search-Ask</a> if you get stuck. Try to pair program. Write your own code.
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</section>
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## Instructions
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<section id='instructions'>
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: '<code>steamrollArray([[["a"]], [["b"]]])</code> should return <code>["a", "b"]</code>.'
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testString: 'assert.deepEqual(steamrollArray([[["a"]], [["b"]]]), ["a", "b"], ''<code>steamrollArray([[["a"]], [["b"]]])</code> should return <code>["a", "b"]</code>.'');'
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- text: '<code>steamrollArray([1, [2], [3, [[4]]]])</code> should return <code>[1, 2, 3, 4]</code>.'
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testString: 'assert.deepEqual(steamrollArray([1, [2], [3, [[4]]]]), [1, 2, 3, 4], ''<code>steamrollArray([1, [2], [3, [[4]]]])</code> should return <code>[1, 2, 3, 4]</code>.'');'
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- text: '<code>steamrollArray([1, [], [3, [[4]]]])</code> should return <code>[1, 3, 4]</code>.'
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testString: 'assert.deepEqual(steamrollArray([1, [], [3, [[4]]]]), [1, 3, 4], ''<code>steamrollArray([1, [], [3, [[4]]]])</code> should return <code>[1, 3, 4]</code>.'');'
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- text: '<code>steamrollArray([1, {}, [3, [[4]]]])</code> should return <code>[1, {}, 3, 4]</code>.'
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testString: 'assert.deepEqual(steamrollArray([1, {}, [3, [[4]]]]), [1, {}, 3, 4], ''<code>steamrollArray([1, {}, [3, [[4]]]])</code> should return <code>[1, {}, 3, 4]</code>.'');'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function steamrollArray(arr) {
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// I'm a steamroller, baby
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return arr;
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}
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steamrollArray([1, [2], [3, [[4]]]]);
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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function steamrollArray(arr) {
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if (!Array.isArray(arr)) {
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return [arr];
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}
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var out = [];
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arr.forEach(function(e) {
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steamrollArray(e).forEach(function(v) {
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out.push(v);
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});
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});
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return out;
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}
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```
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</section>
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