README

Significand

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

Returns an integer corresponding to the significand of a single-precision floating-point number.

Installation

$ npm install math-float32-significand

Usage

var significand = require( 'math-float32-significand' );

significand( x )

Returns an integer corresponding to the significand of a single-precision floating-point number.

var toFloat32 = require( 'float64-to-float32' );

var s = significand( toFloat32( 3.14e34 ) );
// returns 4293751 => 10000011000010001110111

s = significand( toFloat32( 3.14e-34 ) );
// returns 5288021 => 10100001011000001010101

s = significand( toFloat32( -3.14 ) );
// returns 4781507 => 10010001111010111000011

s = significand( 0 );
// returns 0 => 00000000000000000000000

s = significand( NaN );
// returns 4194304 => 10000000000000000000000

Examples

var round = require( 'math-round' );
var pow = require( 'math-power' );
var toFloat32 = require( 'float64-to-float32' );
var significand = require( 'math-float32-significand' );

var frac;
var exp;
var x;
var s;
var i;

// Generate random numbers and extract their significands...
for ( i = 0; i < 100; i++ ) {
    frac = Math.random() * 10;
    exp = round( Math.random()*44 ) - 22;
    x = frac * pow( 10, exp );
    x = toFloat32( x );
    s = significand( x );
    console.log( 'x: %d. significand: %d.', x, s );
}

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-float32-significand

Usage no npm install needed!