23 lines
849 B
Markdown
23 lines
849 B
Markdown
---
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title: initializeArrayWithRange
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tags: array,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.
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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({ 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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