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30-seconds-of-code/snippets/sum.md
Angelos Chalaris 0425ebefe7 Archive, multitagging, cleanup
Cleaned up the current snippets for consistency and minor problems, added multiple tags to most of them, archived a few.
2018-01-05 16:33:54 +02:00

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