Rangecal NPM | npm.io

rangecal

Basic range calculations.

Installation

$ npm install rangecal --save

Usage

var rangecal = require('rangecal')

//------------------------
// amount
//------------------------
console.log(rangecal.amount(3, 6)) //-> 3
console.log(rangecal.amount(2, -8)) //-> -10

//------------------------
// rate
//------------------------
console.log(rangecal.rate(4, 6, 3)) //-> -0.5
console.log(rangecal.rate(2, 9, 6)) //-> 0.5714285714285714

//------------------------
// round
//------------------------
console.log(rangecal.round(4, 6, 3)) //-> 4
console.log(rangecal.round(2, 9, 6)) //-> 6

//------------------------
// contains
//------------------------
console.log(rangecal.contains(4, 6, 3)) //-> false
console.log(rangecal.contains(2, 9, 6)) //-> true

//------------------------
// value
//------------------------
console.log(rangecal.value(3, 6, 0.3)) //-> 3.9
console.log(rangecal.value(2, -8, 0.5)) //-> -3

API

Signature	Description
.amount(min, max)	Get amount in range.
.rate(min, max, value)	Get rate for value in range.
.value(min, max, rate)	Get value for rate in range.
.contains(min, max, value)	Value contained in range or not.
.round(min, max, value)	Round value to fit in range.