10 lines
212 B
Markdown
10 lines
212 B
Markdown
### Sum of array of numbers
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Use `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 =>
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arr.reduce( (acc , val) => acc + val, 0);
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// sum([1,2,3,4]) -> 10
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```
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