normalize-range

What is normalize-range?

The normalize-range npm package is designed to normalize or map a given range of numbers to another range. This can be particularly useful in scenarios where you need to adjust values to fit within a certain scale, such as adjusting sound volume levels, scaling graphical elements, or normalizing data for machine learning purposes.

What are normalize-range's main functionalities?

Normalizing values within a range

This feature allows you to take a value within an original range and normalize it to a new range. The example code demonstrates normalizing the value 5 from the range of 0-10 to the equivalent value in the range of 0-100.

const normalize = require('normalize-range');
let normalizedValue = normalize(5, 0, 10, 0, 100); // Normalizes 5 from a range of 0-10 to a range of 0-100

Other packages similar to normalize-range

d3-scale

Part of the larger D3.js library, 'd3-scale' is a powerful tool for scaling numbers, especially within the context of visual data representation. It supports a wide variety of scales, including linear, logarithmic, and time-based. While more complex, it offers greater flexibility and functionality compared to normalize-range, especially for data visualization purposes.

README

normalize-range

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

Usage

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.

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.

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.

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

Convenience method for currying all method arguments except value.

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