math-float32-to-binary-string
v1.0.0
Published
Returns a string giving the literal bit representation of a single-precision floating-point number.
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Binary String
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
Copyright
Copyright © 2016. The Compute.io Authors.