@fav/arith.reduce

Reduces a number for accurate arithmetics.

"fav" is an abbreviation of "favorite" and also the acronym of "for all versions". This package is intended to support all Node.js versions and many browsers as possible. At least, this package supports Node.js >= v0.10 and major Web browsers: Chrome, Firefox, IE11, Edge, Vivaldi and Safari.

Install

To install from npm:

$ npm install --save @fav/arith.number @fav/arith.reduce

NOTE: npm < 2.7.0 does not support scoped package, but old version Node.js supports it. So when you use such older npm, you should download this package from github.com, and move it in node_modules/@fav/arith.reduce/ directory manually.

Usage

For Node.js:

var ArithNumber = require('@fav/arith.number');
var reduce = require('@fav/arith.reduce');

var num1 = new ArithNumber(123, 45, 1);  // => { numerator: 123, denominator: 45, exponent: 1 }

var num2 = reduce(num1);  // => { numerator: 82, denominator: 3, exponent: 1 }
var num3 = num1.reduce(); // => { numerator: 82, denominator: 3, exponent: 1 }

For Web browsers:

<script src="fav.arith.number.min.js"></script>
<script src="fav.arith.reduce.min.js"></script>
<script>
var ArithNumber = fav.arith.number;
var reduce = fav.arith.reduce;

var num1 = new ArithNumber(123, 45, 1);  // => { numerator: 123, denominator: 45, exponent: 1 }

var num2 = reduce(num1);  // => { numerator: 82, denominator: 3, exponent: 1 }
var num3 = num1.reduce(); // => { numerator: 82, denominator: 3, exponent: 1 }
</script>

API

reduce(arithNumber) : ArithNumber

Reduces an ArithNumber object which consists of three integer: numerator, denominator, exponent and of which value is ( numerator / denominator ) * 10^exponent.

This function reduces to get a possibly minimal denominator with decreasing exponent. For example, (9 / 6) is reduced to not (3 / 2) but (15 / 1) * 10^-1.

Parameters:

| Parameter | Type | Description | |:------------|:-----------:|:-----------------------------------------| | arithNumber | ArithNumber | An ArithNumber object to be reduced. |

Returns:

A new ArithNumber object which was reduced.

Type: ArithNumber

ArithNumber.prototype.reduce() : ArithNumber

This package attaches reduce function to ArithNumber's prototype as its method.

This method reduces the value of ArithNumber object itself and returns a new ArithNumber object having this reduced value.

Returns:

A new ArithNumber object which was reduced.

Type: ArithNumber

Checked

Node.js (11〜)

| Platform | 11 | |:---------:|:------:| | macOS |◯| | Windows10 |◯| | Linux |◯|

Node.js (4〜10)

| Platform | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |:---------:|:------:|:------:|:------:|:------:|:------:|:------:|:------:| | macOS |◯|◯|◯|◯|◯|◯|◯| | Windows10 |◯|◯|◯|◯|◯|◯|◯| | Linux |◯|◯|◯|◯|◯|◯|◯|

io.js (1〜3)

| Platform | 1 | 2 | 3 | |:---------:|:------:|:------:|:------:| | macOS |◯|◯|◯| | Windows10 |◯|◯|◯| | Linux |◯|◯|◯|

Node.js (〜0.12)

| Platform | 0.8 | 0.9 | 0.10 | 0.11 | 0.12 | |:---------:|:------:|:------:|:------:|:------:|:------:| | macOS |◯|◯|◯|◯|◯| | Windows10 |◯|◯|◯|◯|◯| | Linux |◯|◯|◯|◯|◯|

Web browsers

| Platform | Chrome | Firefox | Vivaldi | Safari | Edge | IE11 | |:---------:|:------:|:-------:|:-------:|:------:|:------:|:------:| | macOS |◯|◯ |◯ |◯| -- | -- | | Windows10 |◯|◯ |◯ | -- |◯|◯| | Linux |◯|◯ |◯ | -- | -- | -- |

License

Copyright (C) 2018 Takayuki Sato

This program is free software under MIT License. See the file LICENSE in this distribution for more details.