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.`.
21 lines
732 B
Markdown
21 lines
732 B
Markdown
### longestItem
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Takes any number of iterable objects or objects with a `length` property and returns the longest one.
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If multiple objects have the same length, the first one will be returned.
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Returns `undefined` if no arguments are provided.
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Use `Array.prototype.reduce()`, comparing the `length` of objects to find the longest one.
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```js
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const longestItem = (val, ...vals) =>
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[val, ...vals].reduce((a, x) => (x.length > a.length ? x : a));
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```
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```js
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longestItem('this', 'is', 'a', 'testcase'); // 'testcase'
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longestItem(...['a', 'ab', 'abc']); // 'abc'
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longestItem(...['a', 'ab', 'abc'], 'abcd'); // 'abcd'
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longestItem([1, 2, 3], [1, 2], [1, 2, 3, 4, 5]); // [1, 2, 3, 4, 5]
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longestItem([1, 2, 3], 'foobar'); // 'foobar'
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```
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