2022-01-20 19:30:18 +00:00
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---
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id: ab306dbdcc907c7ddfc30830
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title: ローラーで押し潰せ!
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2022-07-12 11:56:02 +00:00
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challengeType: 1
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2022-01-20 19:30:18 +00:00
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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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ネストされた配列を平坦化してください。 さまざまなレベルのネストを考慮する必要があります。
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# --hints--
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`steamrollArray([[["a"]], [["b"]]])` は `["a", "b"]` を返す必要があります。
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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]]]])` は `[1, 2, 3, 4]` を返す必要があります。
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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]]]])` は `[1, 3, 4]` を返す必要があります。
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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]]]])` は `[1, {}, 3, 4]` を返す必要があります。
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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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解答には `Array.prototype.flat()` メソッドや `Array.prototype.flatMap()` メソッドを使用しないでください。
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```js
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assert(!code.match(/\.\s*flat\s*\(/) && !code.match(/\.\s*flatMap\s*\(/));
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```
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2022-10-18 07:29:49 +00:00
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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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2022-01-20 19:30:18 +00:00
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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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