math-roundn

Roundn

Rounds a numeric value to the nearest multiple of 10^n.

Installation

$ npm install math-roundn

Usage

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

roundn( x, n )

Rounds a numeric value to the nearest multiple of 10^n.

// Round a value to 2 decimal places:
var val = roundn( Math.PI, -2 );
// returns 3.14
 
// If n = 0, `roundn` behaves like `round`:
val = roundn( Math.PI, 0 );
// returns 3
 
// Round a value to the nearest thousand:
val = roundn( 12368, 3 );
// returns 12000

Examples

var roundn = require( 'math-roundn' );
 
var x;
var n;
var i;
 
for ( i = 0; i < 100; i++ ) {
    x = Math.random()*100 - 50;
    n = roundn( Math.random()*5, 0 );
    console.log( 'Value: %d. Number of decimals: %d. Rounded: %d.', x, n, roundn( x, -n ) );
}

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.