23 lines
576 B
Markdown
23 lines
576 B
Markdown
---
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title: inRange
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tags: math,beginner
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---
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Checks if the given number falls within the given range.
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Use arithmetic comparison to check if the given number is in the specified range.
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If the second parameter, `end`, is not specified, the range is considered to be from `0` to `start`.
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```js
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const inRange = (n, start, end = null) => {
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if (end && start > end) [end, start] = [start, end];
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return end == null ? n >= 0 && n < start : n >= start && n < end;
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};
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```
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```js
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inRange(3, 2, 5); // true
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inRange(3, 4); // true
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inRange(2, 3, 5); // false
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inRange(3, 2); // false
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``` |