math-abs

Computes an absolute value.

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Readme

Absolute Value
!NPM versionnpm-imagenpm-url !Build Statusbuild-imagebuild-url !Coverage Statuscoverage-imagecoverage-url !Dependenciesdependencies-imagedependencies-url
Computes an absolute valueabsolute-value.

The absolute valueabsolute-value is defined as
<img src="https://cdn.rawgit.com/math-io/abs/ea1d4096f7300f593d29705b025c1f7bf47da1b5/docs/img/eqn.svg" alt="Absolute value definition.">
<br>

Installation

$ npm install math-abs

Usage

var abs = require( 'math-abs' );

abs( x )

Computes an absolute valueabsolute-value.
var val = abs( -1 );
// returns 1

val = abs( 2 );
// returns 2

val = abs( 0 );
// returns 0

val = abs( -0 );
// returns 0

Examples

var abs = require( 'math-abs' );

var rand;
var sign;
var i;
for ( i = 0; i < 100; i++ ) {
	rand = Math.round( Math.random() * 100 ) - 50;
	sign = Math.random();
	if ( sign < 0.5 ) {
		sign = -1;
	} else {
		sign = 1;
	}
	console.log( 'Before: %d. After: %d.', rand, abs( rand ) );
}

To run the example code from the top-level application directory,
$ node ./examples/index.js

Tests

Unit

This repository uses tapetape 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 Istanbulistanbul 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 Testlingtestling 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.

Copyright

Copyright © 2016. The Compute.iocompute-io Authors.