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Update sumPower.md

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Angelos Chalaris
2018-01-01 16:23:58 +02:00
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### sumPower ### sumPower
Returns the sum of the powers of all the numbers from `start` to `end`. Returns the sum of the powers of all the numbers from `start` to `end` (both inclusive).
Use `Array.fill()` to create an array of all the numbers in the target range, `Array.map()` and the exponent operator (`**`) to raise them to `power` and `Array.reduce()` to add them together. Use `Array.fill()` to create an array of all the numbers in the target range, `Array.map()` and the exponent operator (`**`) to raise them to `power` and `Array.reduce()` to add them together.
Omit the second argument, `power`, to use a default power of `2`. Omit the second argument, `power`, to use a default power of `2`.
@ -8,7 +8,7 @@ Omit the third argument, `start`, to use a default starting value of `1`.
```js ```js
const sumPower = (end,power = 2,start = 1) => const sumPower = (end,power = 2,start = 1) =>
Array(end - start).fill(0).map((x,i) => (i+start) ** power).reduce((a,b) => a+b,0) Array(end + 1 - start).fill(0).map((x,i) => (i+start) ** power).reduce((a,b) => a+b,0)
``` ```
```js ```js