12 lines
457 B
Markdown
12 lines
457 B
Markdown
### percentile
|
|
|
|
Uses the percentile formula to calculate how many numbers in the given array are less or equal to the given value.
|
|
|
|
Use `Array.reduce()` 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) =>
|
|
100 * arr.reduce((acc,v) => acc + (v < val ? 1 : 0) + (v === val ? 0.5 : 0), 0) / arr.length;
|
|
// percentile([1,2,3,4,5,6,7,8,9,10], 6) -> 55
|
|
```
|