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math-float64-exponent
Advanced tools
Returns an integer corresponding to the unbiased exponent of a double-precision floating-point number.
Returns an integer corresponding to the unbiased exponent of a double-precision floating-point number.
$ npm install math-float64-exponent
var exponent = require( 'math-float64-exponent' );
Returns an integer
corresponding to the unbiased exponent of a double-precision floating-point number.
var exp = exponent( 3.14e307 );
// returns 1021 => 2**1021 ~ 1e307
var exp = exponent( 3.14e-307 );
// returns -1019 => 2**-1019 ~ 1e-307
exp = exponent( -3.14 );
// returns 1
exp = exponent( 0 );
// returns 0
exp = exponent( NaN );
// returns 1024 => 2**1024 ~ infinity
var round = require( 'math-round' );
var pow = require( 'math-power' );
var exponent = require( 'math-float64-exponent' );
var frac;
var exp;
var x;
var e;
var i;
// Generate random numbers and extract their exponents...
for ( i = 0; i < 100; i++ ) {
frac = Math.random() * 10;
exp = round( Math.random()*646 ) - 323;
x = frac * pow( 10, exp );
e = exponent( x );
console.log( 'x: %d. unbiased exponent: %d.', x, e );
}
To run the example code from the top-level application directory,
$ node ./examples/index.js
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.
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
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
Copyright © 2016. The Compute.io Authors.
FAQs
Returns an integer corresponding to the unbiased exponent of a double-precision floating-point number.
The npm package math-float64-exponent receives a total of 4,590 weekly downloads. As such, math-float64-exponent popularity was classified as popular.
We found that math-float64-exponent demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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