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