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# normalize-range 

Utility for normalizing a numeric range, with a wrapping function useful for polar coordinates.

[![Build Status](https://travis-ci.org/jamestalmage/normalize-range.svg?branch=master)](https://travis-ci.org/jamestalmage/normalize-range)
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[![Code Climate](https://codeclimate.com/github/jamestalmage/normalize-range/badges/gpa.svg)](https://codeclimate.com/github/jamestalmage/normalize-range)
[![Dependency Status](https://david-dm.org/jamestalmage/normalize-range.svg)](https://david-dm.org/jamestalmage/normalize-range)
[![devDependency Status](https://david-dm.org/jamestalmage/normalize-range/dev-status.svg)](https://david-dm.org/jamestalmage/normalize-range#info=devDependencies)

[![NPM](https://nodei.co/npm/normalize-range.png)](https://nodei.co/npm/normalize-range/)

## Usage

```js
var nr = require('normalize-range');

nr.wrap(0, 360, 400);
//=> 40

nr.wrap(0, 360, -90);
//=> 270

nr.limit(0, 100, 500);
//=> 100

nr.limit(0, 100, -20);
//=> 0

// There is a convenient currying function
var wrapAngle = nr.curry(0, 360).wrap;
var limitTo10 = nr.curry(0, 10).limit;

wrapAngle(-30);
//=> 330
```
## API

### wrap(min, max, value)

Normalizes a values that "wraps around". For example, in a polar coordinate system, 270˚ can also be
represented as -90˚. 
For wrapping purposes we assume `max` is functionally equivalent to `min`, and that `wrap(max + 1) === wrap(min + 1)`.
Wrap always assumes that `min` is *inclusive*, and `max` is *exclusive*.
In other words, if `value === max` the function will wrap it, and return `min`, but `min` will not be wrapped.

```js
nr.wrap(0, 360, 0) === 0;
nr.wrap(0, 360, 360) === 0;
nr.wrap(0, 360, 361) === 1;
nr.wrap(0, 360, -1) === 359;
```

You are not restricted to whole numbers, and ranges can be negative.

```js
var π = Math.PI;
var radianRange = nr.curry(-π, π);

redianRange.wrap(0) === 0;
nr.wrap(π) === -π;
nr.wrap(4 * π / 3) === -2 * π / 3;
```

### limit(min, max, value)

Normalize the value by bringing it within the range.
If `value` is greater than `max`, `max` will be returned.
If `value` is less than `min`, `min` will be returned.
Otherwise, `value` is returned unaltered.
Both ends of this range are *inclusive*.

### test(min, max, value, [minExclusive], [maxExclusive])

Returns `true` if `value` is within the range, `false` otherwise.
It defaults to `inclusive` on both ends of the range, but that can be
changed by setting `minExclusive` and/or `maxExclusive` to a truthy value.

### validate(min, max, value, [minExclusive], [maxExclusive])

Returns `value` or throws an error if `value` is outside the specified range.

### name(min, max, value, [minExclusive], [maxExclusive])

Returns a string representing this range in 
[range notation](https://en.wikipedia.org/wiki/Interval_(mathematics)#Classification_of_intervals).

### curry(min, max, [minExclusive], [maxExclusive])

Convenience method for currying all method arguments except `value`.

```js
var angle = require('normalize-range').curry(-180, 180, false, true);

angle.wrap(270)
//=> -90

angle.limit(200)
//=> 180

angle.test(0)
//=> true

angle.validate(300)
//=> throws an Error

angle.toString() // or angle.name()
//=> "[-180,180)"
```

#### min

*Required*  
Type: `number`

The minimum value (inclusive) of the range.

#### max

*Required*  
Type: `number`

The maximum value (exclusive) of the range.

#### value

*Required*  
Type: `number`

The value to be normalized.

#### returns

Type: `number`

The normalized value.

## Building and Releasing

- `npm test`: tests, linting, coverage and style checks.
- `npm run watch`: autotest mode for active development.
- `npm run debug`: run tests without coverage (istanbul can obscure line #'s) 

Release via `cut-release` tool.

## License

MIT © [James Talmage](http://github.com/jamestalmage)

Anon7 - 2022
AnonSec Team