Absolute Value

Computes an absolute value.

The absolute value is defined as

Installation

$ npm install math-abs

Usage

var abs = require( 'math-abs' );

abs( x )

Computes an absolute 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

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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

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License

MIT license.

Copyright

Copyright © 2016. The Compute.io Authors.