11 lines
342 B
Markdown
11 lines
342 B
Markdown
### Percentile
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Use `Array.reduce()` to calculate how many numbers are below the value and how many are the same value and
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apply the percentile formula.
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```js
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const percentile = (arr, val) =>
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100 * arr.reduce((acc,v) => acc + (v < val ? 1 : 0) + (v === val ? 0.5 : 0), 0) / arr.length;
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// percentile([1,2,3,4,5,6,7,8,9,10], 6) -> 55
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```
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