8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
17 lines
456 B
Markdown
17 lines
456 B
Markdown
### nthElement
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Returns the nth element of an array.
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Use `Array.prototype.slice()` to get an array containing the nth element at the first place.
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If the index is out of bounds, return `undefined`.
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Omit the second argument, `n`, to get the first element of the array.
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```js
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const nthElement = (arr, n = 0) => (n === -1 ? arr.slice(n) : arr.slice(n, n + 1))[0];
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```
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```js
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nthElement(['a', 'b', 'c'], 1); // 'b'
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nthElement(['a', 'b', 'b'], -3); // 'a'
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```
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