Nest all content into snippets

snippets/js/s/average.md

@@ -0,0 +1,23 @@
+---
+title: Average of numbers
+type: snippet
+language: javascript
+tags: [math]
+cover: interior-8
+dateModified: 2020-10-22T20:23:47+03:00
+---
+
+Calculates the average of two or more numbers.
+
+- Use `Array.prototype.reduce()` to add each value to an accumulator, initialized with a value of `0`.
+- Divide the resulting array by its length.
+
+```js
+const average = (...nums) =>
+  nums.reduce((acc, val) => acc + val, 0) / nums.length;
+```
+
+```js
+average(...[1, 2, 3]); // 2
+average(1, 2, 3); // 2
+```