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Update InitializeArrayWithRange.md

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Update InitializeArrayWithRange.md to include another parameter step
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Rohit Tanwar
2018-01-03 12:30:55 +05:30
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snippets/initializeArrayWithRange.md
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### initializeArrayWithRange ### initializeArrayWithRange
Initializes an array containing the numbers in the specified range where `start` and `end` are inclusive. Initializes an array containing the numbers in the specified range where `start` and `end` are inclusive with there common difference `step`.
Use `Array((end + 1) - start)` to create an array of the desired length, `Array.map()` to fill with the desired values in a range. Use `Array(Math.ceil((end + 1) - start)/2)` 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`. You can omit `start` to use a default value of `0`.
You can omit `step` to use a default value of `1`.
```js ```js
const initializeArrayWithRange = (end, start = 0) => const initializeArrayWithRange = (end, start = 0,step = 1) =>
Array.from({ length: end + 1 - start }).map((v, i) => i + start); Array(Math.ceil((end + 1 - start)/2)).fill(0).map((v, i) => (i * step) + start);
``` ```
```js ```js
initializeArrayWithRange(5); // [0,1,2,3,4,5] initializeArrayWithRange(5); // [0,1,2,3,4,5]
initializeArrayWithRange(7, 3); // [3,4,5,6,7] initializeArrayWithRange(7, 3); // [3,4,5,6,7]
initializeArrayWithRange(9,0,2); //[0,2,4,6,8]
``` ```