add sumPower

snippets/sumPower.md

@@ -0,0 +1,15 @@
+### sumPower
+
+Returns the sum of the powers of all the numbers from `start`(default to 1) to `end`
+
+```js
+const sumPower = (end,power = 2,start = 1)
+  Array(end - start).fill(0).map((x,i) => (i+start) ** power).reduce((a,b) => a+b,0)
+```
+
+```js
+sumPower(10); // 385
+sumPower(10,3); //3025
+sumPower(10,3,5); //2925
+sumPower(10,undefined,5); //355
+```