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Merge pull request #713 from EthanOrange/patch-4

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Update initializeArrayWithRange snippet
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Angelos Chalaris
2018-08-13 14:22:33 +03:00
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parent 6d0acc6a7e b0c1cb95e0
commit 034193a80c
3 changed files with 10 additions and 4 deletions
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snippets/initializeArrayWithRange.md
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@ -2,13 +2,13 @@
Initializes an array containing the numbers in the specified range where `start` and `end` are inclusive with their common difference `step`.
Use `Array.from(Math.ceil((end+1-start)/step))` to create an array of the desired length(the amounts of elements is equal to `(end-start)/step` or `(end+1-start)/step` for inclusive end), `Array.map()` to fill with the desired values in a range.
Use `Array.from()` to create an array of the desired length, `(end - start + 1)/step`, and a map function to fill it with the desired values in the given range.
You can omit `start` to use a default value of `0`.
You can omit `step` to use a default value of `1`.
```js
const initializeArrayWithRange = (end, start = 0, step = 1) =>
Array.from({ length: Math.ceil((end + 1 - start) / step) }).map((v, i) => i * step + start);
Array.from({length: Math.ceil((end - start + 1) / step)}, (v, i) => i * step + start);
```
```js