RelativeChange.js

Javascript library for calculating relative quantity changes, such as:

50  => 200 = 3     (+300%) (x4)
200 => 50  = -0.75 (-75%)  (x0.25)

Demo

Click here for a demo

Example of Usage

var initial_quantity = 50,
    final_quantity   = 200;
    
var relchange_instance = RelativeChange.Raw.calculate(initial_quantity, final_quantity);
var relchange = relchange_instance.val(); // 3

// Feeling like some convertions
var percentage_instance = relchange_instance.percentage();
var percentage = relchangepercentage_instance.val(); // 300 (+300%)
var multiplier_instance = relchange_instance.multiplier();
var multiplier = multiplier_instance.val(); // 4 (x4)

API

RelativeChange.Raw constructors

All constructors return instance of RelativeChange.Raw

• calculate(/*Number */initial_quantity, /*Number */final_quantity)
• fromRaw(/*Number */relchange)
• fromPercentage(/*Number */percentage)
• fromMultiplier(/*Number */multiplier)

RelativeChange.Raw instance methods

• val() @returns instance of Number
• percentage() @returns instance of RelativeChange.Percentage
• multiplier() @returns instance of RelativeChange.Multiplier

RelativeChange.Percentage constructors

All constructors return instance of RelativeChange.Percentage

• calculate(/*Number */initial_quantity, /*Number */final_quantity)
• fromRaw(/*Number */relchange)
• fromPercentage(/*Number */percentage)
• fromMultiplier(/*Number */multiplier)

RelativeChange.Percentage instance methods

• val() @returns instance of Number
• raw() @returns instance of RelativeChange.Raw
• multiplier() @returns instance of RelativeChange.Multiplier

RelativeChange.Multiplier constructors

All constructors return instance of RelativeChange.Multiplier

• calculate(/*Number */initial_quantity, /*Number */final_quantity)
• fromRaw(/*Number */relchange)
• fromPercentage(/*Number */percentage)
• fromMultiplier(/*Number */multiplier)

RelativeChange.Multiplier instance methods

• val() @returns instance of Number
• raw() @returns instance of RelativeChange.Raw
• percentage() @returns instance of RelativeChange.Percentage