f2e5e26af3
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.`.
24 lines
706 B
Markdown
24 lines
706 B
Markdown
### quickSort
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QuickSort an Array (ascending sort by default).
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Use recursion.
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Use `Array.prototype.filter` and spread operator (`...`) to create an array that all elements with values less than the pivot come before the pivot, and all elements with values greater than the pivot come after it.
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If the parameter `desc` is truthy, return array sorts in descending order.
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```js
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const quickSort = ([n, ...nums], desc) =>
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isNaN(n)
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? []
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: [
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...quickSort(nums.filter(v => (desc ? v > n : v <= n)), desc),
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n,
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...quickSort(nums.filter(v => (!desc ? v > n : v <= n)), desc)
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];
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```
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```js
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quickSort([4, 1, 3, 2]); // [1,2,3,4]
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quickSort([4, 1, 3, 2], true); // [4,3,2,1]
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```
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