npm package: @stdlib/number-float64-base-assert-is-same-value-zero
Description: Test if two double-precision floating-point numbers are the same value.
Author: The Stdlib Authors
Latest version: 0.1.2

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# isSameValueZero

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

> Test if two double-precision floating-point numbers are the same value.

<section class="installation">

## Installation

```bash
npm install @stdlib/number-float64-base-assert-is-same-value-zero
```

</section>

<section class="usage">

## Usage

```javascript
var isSameValueZero = require( '@stdlib/number-float64-base-assert-is-same-value-zero' );
```

#### isSameValueZero( a, b )

Tests if two double-precision floating-point numbers `a` and `b` are the same value.

```javascript
var bool = isSameValueZero( 3.14, 3.14 );
// returns true

bool = isSameValueZero( 5.0, 3.0 );
// returns false
```

In contrast to the strict equality operator `===`, the function treats `NaNs` as the same value.

<!-- eslint-disable use-isnan -->

```javascript
var bool = ( NaN === NaN );
// returns false

bool = isSameValueZero( NaN, NaN );
// returns true
```

In contrast to the [SameValue Algorithm][@stdlib/number/float64/base/assert/is-same-value] (as specified in ECMAScript 5), the function does not distinguish between `+0` and `-0`.

<!-- eslint-disable no-compare-neg-zero -->

```javascript
var bool = ( 0.0 === -0.0 );
// returns true

bool = isSameValueZero( 0.0, -0.0 );
// returns true

bool = isSameValueZero( -0.0, 0.0 );
// returns true
```

</section>

<!-- /.usage -->

<section class="notes">

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var isSameValueZero = require( '@stdlib/number-float64-base-assert-is-same-value-zero' );

var bool = isSameValueZero( 3.14, 3.14 );
// returns true

bool = isSameValueZero( 0.0, 0.0 );
// returns true

bool = isSameValueZero( -0.0, 0.0 );
// returns true

bool = isSameValueZero( NaN, NaN );
// returns true
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

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<section class="intro">

</section>

<!-- /.intro -->

<!-- C usage documentation. -->

<section class="usage">

### Usage

```c
#include "stdlib/number/float64/base/assert/is_same_value_zero.h"
```

#### stdlib_base_float64_is_same_value_zero( a, b )

Tests if two double-precision floating-point numbers `a` and `b` are the same value.

```c
#include <stdbool.h>

bool v = stdlib_base_float64_is_same_value_zero( 3.14, 3.14 );
// returns true

v = stdlib_base_float64_is_same_value_zero( 0.0, -0.0 );
// returns true
```

The function accepts the following arguments:

-   **a**: `[in] double` first input value.
-   **b**: `[in] double` second input value.

```c
bool stdlib_base_float64_is_same_value_zero( const double a, const double b );
```

</section>

<!-- /.usage -->

<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

</section>

<!-- /.notes -->

<!-- C API usage examples. -->

<section class="examples">

### Examples

```c
#include "stdlib/number/float64/base/assert/is_same_value_zero.h"
#include <stdbool.h>
#include <stdio.h>

int main( void ) {
    const double a[] = {
        5.0,
        -2.0,
        0.0,
        0.0/0.0
    };
    const double b[] = {
        5.0,
        2.0,
        -0.0,
        0.0/0.0
    };

    bool v;
    int i;
    for ( i = 0; i < 4; i++ ) {
        v = stdlib_base_float64_is_same_value_zero( a[ i ], b[ i ] );
        printf( "Same value? %s\n", ( v ) ? "True" : "False" );
    }
}
```

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

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

<section class="related">

</section>

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<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].

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