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math-absolute-difference

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Readme

Absolute Difference

$NPM version$ $Build Status$ $Coverage Status$ $Dependencies$

Computes the absolute difference of two real numbers.

The absolute difference of two real numbers is defined as the absolute value of their difference.

$Absolute difference$

Installation

$ npm install math-absolute-difference

Usage

var diff = require( 'math-absolute-difference' );

diff( x, y )

Computes the absolute difference of two real numbers.

var d = diff( 2, 5 );
// returns 3

d = diff( -1, 3.14 );
// returns ~4.14

d = diff( 10.1, -2.05 );
// returns ~12.15

d = diff( -0, 0 );
// returns 0

d = diff( NaN, 5 );
// returns NaN

d = diff( 5, NaN );
// returns NaN

var PINF = Number.POSITIVE_INFINITY;
var NINF = Number.NEGATIVE_INFINITY;

d = diff( PINF, PINF );
// returns NaN

d = diff( NINF, NINF );
// returns NaN

d = diff( PINF, NINF );
// returns +infinity

d = diff( NINF, PINF );
// returns +infinity

Examples

var diff = require( 'math-absolute-difference' );

var x;
var y;
var d;
var i;

for ( i = 0; i < 100; i++ ) {
    x = Math.random()*1e4 - 1e2;
    y = Math.random()*1e4 - 1e2;
    d = diff( x, y );
    console.log( 'x = %d. y = %d. |x-y| = %d.', x, y, d );
}

To run the example code from the top-level application directory,

$ node ./examples/index.js

Tests

Unit

This repository uses tape for unit tests. To run the tests, execute the following command in the top-level application directory:

$ make test

All new feature development should have corresponding unit tests to validate correct functionality.

Test Coverage

This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:

$ make test-cov

Istanbul creates a ./reports/coverage directory. To access an HTML version of the report,

$ make view-cov

Browser Support

This repository uses Testling for browser testing. To run the tests in a (headless) local web browser, execute the following command in the top-level application directory:

$ make test-browsers

To view the tests in a local web browser,

$ make view-browser-tests

License

MIT license.

math-absolute-difference