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snippets/arraySum.md

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+### arraySum
+
+Returns the sum of an array of numbers.
+
+Use `Array.reduce()` to add each value to an accumulator, initialized with a value of `0`.
+
+```js
+const arraySum = arr => arr.reduce((acc, val) => acc + val, 0);
+// sum([1,2,3,4]) -> 10
+```