Takes any number of iterable objects or objects with a length
property and returns the longest one.
- Use
Array.prototype.reduce()
, comparing the length of objects to find the longest one. - If multiple objects have the same length, the first one will be returned.
- Returns
undefined
if no arguments are provided.
代码实现
const longestItem = (...vals) =>
vals.reduce((a, x) => (x.length > a.length ? x : a));
longestItem('this', 'is', 'a', 'testcase'); // 'testcase'
longestItem(...['a', 'ab', 'abc']); // 'abc'
longestItem(...['a', 'ab', 'abc'], 'abcd'); // 'abcd'
longestItem([1, 2, 3], [1, 2], [1, 2, 3, 4, 5]); // [1, 2, 3, 4, 5]
longestItem([1, 2, 3], 'foobar'); // 'foobar'
翻译自:https://www.30secondsofcode.org/js/s/longest-array-element