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30-seconds-of-code/snippets/initializeArrayWithRange.md
2017-12-28 08:30:19 +00:00

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### initializeArrayWithRange
Initializes an array containing the numbers in the specified range where `start` and `end` are inclusive.
Use `Array((end + 1) - start)` to create an array of the desired length, `Array.map()` to fill with the desired values in a range.
You can omit `start` to use a default value of `0`.
```js
const initializeArrayWithRange = (end, start = 0) =>
Array.from({ length: end + 1 - start }).map((v, i) => i + start);
```
```js
initializeArrayWithRange(5); // [0,1,2,3,4,5]
initializeArrayWithRange(7, 3); // [3,4,5,6,7]
```