npm package: @stdlib/number-float64-base-to-binary-string
Description: Return a string giving the literal bit representation of a double-precision floating-point number.
Author: The Stdlib Authors
Latest version: 0.2.3

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<details>
  <summary>
    About stdlib...
  </summary>
  <p>We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.</p>
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</details>

# Binary String

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Return a string giving the literal bit representation of a [double-precision floating-point number][ieee754].

<section class="installation">

## Installation

```bash
npm install @stdlib/number-float64-base-to-binary-string
```

</section>

<section class="usage">

## Usage

```javascript
var toBinaryString = require( '@stdlib/number-float64-base-to-binary-string' );
```

#### toBinaryString( x )

Returns a `string` giving the literal bit representation of a [double-precision floating-point number][ieee754].

```javascript
var str = toBinaryString( 4.0 );
// returns '0100000000010000000000000000000000000000000000000000000000000000'

str = toBinaryString( 3.141592653589793 );
// returns '0100000000001001001000011111101101010100010001000010110100011000'

str = toBinaryString( -1.0e308 );
// returns '1111111111100001110011001111001110000101111010111100100010100000'
```

The function handles [subnormals][subnormals].

```javascript
var str = toBinaryString( -3.14e-320 );
// returns '1000000000000000000000000000000000000000000000000001100011010011'

str = toBinaryString( 5.0e-324 );
// returns '0000000000000000000000000000000000000000000000000000000000000001'
```

The function handles special values.

```javascript
var str = toBinaryString( 0.0 );
// returns '0000000000000000000000000000000000000000000000000000000000000000'

str = toBinaryString( -0.0 );
// returns '1000000000000000000000000000000000000000000000000000000000000000'

str = toBinaryString( NaN );
// returns '0111111111111000000000000000000000000000000000000000000000000000'

str = toBinaryString( Infinity );
// returns '0111111111110000000000000000000000000000000000000000000000000000'

str = toBinaryString( -Infinity );
// returns '1111111111110000000000000000000000000000000000000000000000000000'
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var pow = require( '@stdlib/math-base-special-pow' );
var toBinaryString = require( '@stdlib/number-float64-base-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 ( randu() < 0.5 ) {
        sign = -1.0;
    } else {
        sign = 1.0;
    }
    frac = randu() * 10.0;
    exp = round( randu()*100.0 );
    if ( randu() < 0.5 ) {
        exp = -exp;
    }
    x = sign * frac * pow( 2.0, exp );
    b = toBinaryString( x );
    console.log( b );
}
```

</section>

<!-- /.examples -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/number-float64/base/from-binary-string`][@stdlib/number/float64/base/from-binary-string]</span><span class="delimiter">: </span><span class="description">create a double-precision floating-point number from a literal bit representation.</span>
-   <span class="package-name">[`@stdlib/number-float32/base/to-binary-string`][@stdlib/number/float32/base/to-binary-string]</span><span class="delimiter">: </span><span class="description">return a string giving the literal bit representation of a single-precision floating-point number.</span>

</section>

<!-- /.related -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->


<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

</section>

<!-- /.stdlib -->

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[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules

[deno-url]: https://github.com/stdlib-js/number-float64-base-to-binary-string/tree/deno
[deno-readme]: https://github.com/stdlib-js/number-float64-base-to-binary-string/blob/deno/README.md
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[esm-url]: https://github.com/stdlib-js/number-float64-base-to-binary-string/tree/esm
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[branches-url]: https://github.com/stdlib-js/number-float64-base-to-binary-string/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/number-float64-base-to-binary-string/main/LICENSE

[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985

[subnormals]: https://en.wikipedia.org/wiki/Denormal_number

<!-- <related-links> -->

[@stdlib/number/float64/base/from-binary-string]: https://www.npmjs.com/package/@stdlib/number-float64-base-from-binary-string

[@stdlib/number/float32/base/to-binary-string]: https://www.npmjs.com/package/@stdlib/number-float32-base-to-binary-string

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</section>

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