20 lines
418 B
Markdown
20 lines
418 B
Markdown
---
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title: sum
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tags: math,array,beginner
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firstSeen: 2017-12-29T13:29:49+02:00
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lastUpdated: 2020-10-22T20:24:30+03:00
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---
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Calculates the sum of two or more numbers/arrays.
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- Use `Array.prototype.reduce()` to add each value to an accumulator, initialized with a value of `0`.
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```js
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const sum = (...arr) => [...arr].reduce((acc, val) => acc + val, 0);
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```
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```js
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sum(1, 2, 3, 4); // 10
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sum(...[1, 2, 3, 4]); // 10
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```
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