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math-float32-to-binary-string

1.0.0 • Public • Published

Binary String

NPM version Build Status Coverage Status Dependencies

Returns a string giving the literal bit representation of a single-precision floating-point number.

Installation

$ npm install math-float32-to-binary-string

Usage

var binaryString = require( 'math-float32-to-binary-string' );

binaryString( x )

Returns a string giving the literal bit representation of a single-precision floating-point number.

var toFloat32 = require( 'float64-to-float32' );
 
var str = binaryString( toFloat32( 4 ) );
// returns '01000000100000000000000000000000'
 
str = binaryString( toFloat32( Math.PI ) );
// returns '01000000010010010000111111011011'
 
str = binaryString( toFloat32( -1e38 ) );
// returns '11111110100101100111011010011001'

The function handles subnormals.

str = binaryString( toFloat32( -3.14e-39 ) );
// returns '10000000001000100011000100001011'
 
str = binaryString( toFloat32( 1.4e-45 ) );
// returns '00000000000000000000000000000001'

The function handles special values.

var pinf = require( 'const-pinf-float32' );
var ninf = require( 'const-ninf-float32' );
 
str = binaryString( 0 );
// returns '00000000000000000000000000000000'
 
str = binaryString( -0 );
// returns '10000000000000000000000000000000'
 
str = binaryString( NaN );
// returns '01111111110000000000000000000000'
 
str = binaryString( pinf );
// returns '01111111100000000000000000000000'
 
str = binaryString( ninf );
// returns '11111111100000000000000000000000'

Examples

var round = require( 'math-round' );
var pow = require( 'math-power' );
var float64ToFloat32 = require( 'float64-to-float32' );
var binaryString = require( 'math-float32-to-binary-string' );
 
var frac;
var sign;
var exp;
var b;
var x;
var i;
 
// Convert random numbers to literal bit representations...
for ( i = 0; i < 100; i++ ) {
    if ( Math.random() < 0.5 ) {
        sign = -1;
    } else {
        sign = 1;
    }
    frac = Math.random() * 10;
    exp = round( Math.random()*100 );
    if ( Math.random() < 0.5 ) {
        exp = -exp;
    }
    x = sign * frac * pow( 2, exp );
    x = float64ToFloat32( x );
    b = binaryString( x );
    console.log( b );
}

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.

Copyright

Copyright © 2016. The Compute.io Authors.

Install

npm i math-float32-to-binary-string

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882

Version

1.0.0

License

MIT

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