31 lines
1.0 KiB
Markdown
31 lines
1.0 KiB
Markdown
---
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title: Initialize array with range
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type: snippet
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language: javascript
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tags: [array]
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cover: spanish-resort
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excerpt: Initializes an inclusive array with numbers in a range, using a common `step` difference.
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dateModified: 2020-10-22T20:23:47+03:00
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---
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Initializes an array containing the numbers in the specified range where `start` and `end` are inclusive with their common difference `step`.
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- Use `Array.from()` to create an array of the desired length.
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- Use `(end - start + 1) / step` and a map function to fill the array with the desired values in the given range.
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- Omit the second argument, `start`, to use a default value of `0`.
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- Omit the last argument, `step`, to use a default value of `1`.
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```js
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const initializeArrayWithRange = (end, start = 0, step = 1) =>
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Array.from(
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{ length: Math.ceil((end - start + 1) / step) },
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(_, i) => i * step + start
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);
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```
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```js
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initializeArrayWithRange(5); // [0, 1, 2, 3, 4, 5]
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initializeArrayWithRange(7, 3); // [3, 4, 5, 6, 7]
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initializeArrayWithRange(9, 0, 2); // [0, 2, 4, 6, 8]
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```
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