15 lines
475 B
Markdown
15 lines
475 B
Markdown
### percentile
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Uses the percentile formula to calculate how many numbers in the given array are less or equal to the given value.
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Use `Array.reduce()` to calculate how many numbers are below the value and how many are the same value and 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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```
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```js
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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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