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80 lines
1.5 KiB
Markdown
80 lines
1.5 KiB
Markdown
---
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id: ab306dbdcc907c7ddfc30830
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title: Steamroller
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challengeType: 1
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forumTopicId: 16079
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dashedName: steamroller
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---
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# --description--
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Flatten a nested array. You must account for varying levels of nesting.
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# --hints--
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`steamrollArray([[["a"]], [["b"]]])` should return `["a", "b"]`.
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```js
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assert.deepEqual(steamrollArray([[['a']], [['b']]]), ['a', 'b']);
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```
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`steamrollArray([1, [2], [3, [[4]]]])` should return `[1, 2, 3, 4]`.
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```js
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assert.deepEqual(steamrollArray([1, [2], [3, [[4]]]]), [1, 2, 3, 4]);
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```
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`steamrollArray([1, [], [3, [[4]]]])` should return `[1, 3, 4]`.
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```js
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assert.deepEqual(steamrollArray([1, [], [3, [[4]]]]), [1, 3, 4]);
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```
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`steamrollArray([1, {}, [3, [[4]]]])` should return `[1, {}, 3, 4]`.
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```js
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assert.deepEqual(steamrollArray([1, {}, [3, [[4]]]]), [1, {}, 3, 4]);
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```
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Your solution should not use the `Array.prototype.flat()` or `Array.prototype.flatMap()` methods.
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```js
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assert(!__helpers.removeJSComments(code).match(/\.\s*flat\s*\(/) && !__helpers.removeJSComments(code).match(/\.\s*flatMap\s*\(/));
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```
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Global variables should not be used.
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```js
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steamrollArray([1, {}, [3, [[4]]]])
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assert.deepEqual(steamrollArray([1, {}, [3, [[4]]]]), [1, {}, 3, 4])
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```
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# --seed--
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## --seed-contents--
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```js
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function steamrollArray(arr) {
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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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# --solutions--
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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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