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Update percentile.md

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atomiks
2017-12-13 22:18:49 +11:00
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snippets/percentile.md
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### Percentile
Calculate how many numbers are below the value and how many are the same value and
Use `Array.filter()` to calculate how many numbers are below the value and how many are the same value and
apply the percentile formula.
```js
const percentile = (arr, val) => {
let below = 0, same = 0;
for (const number of arr) {
if (number < val) below++;
if (number === val) same++;
}
return 100 * (below + (0.5 * same)) / arr.length;
};
const percentile = (arr, val) =>
100 * (arr.filter(v => v < val).length + 0.5 * arr.filter(v => v === val).length) / arr.length;
// percentile([1,2,3,4,5,6,7,8,9,10], 6) -> 55
```