22 lines
803 B
Markdown
22 lines
803 B
Markdown
---
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title: initializeArrayWithRange
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tags: array,math,intermediate
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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, `(end - start + 1)/step`, and a map function to fill it with the desired values in the given range.
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- You can omit `start` to use a default value of `0`.
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- You can omit `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({ length: Math.ceil((end - start + 1) / step) }, (v, i) => i * step + start);
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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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