time-to-botec/squiggle/node_modules/@stdlib/math/base/assert/is-negative-integer/README.md

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# isNegativeInteger

> Test if a finite [double-precision floating-point number][ieee754] is a negative integer.

<section class="usage">

## Usage

```javascript
var isNegativeInteger = require( '@stdlib/math/base/assert/is-negative-integer' );
```

#### isNegativeInteger( x )

Tests if a finite [double-precision floating-point number][ieee754] is a negative `integer`.

```javascript
var bool = isNegativeInteger( -1.0 );
// returns true

bool = isNegativeInteger( 0.0 );
// returns false

bool = isNegativeInteger( 10.0 );
// returns false
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   The function assumes a **finite** `number`. If provided negative `infinity`, the function will return `true`, when, in fact, the result is undefined. If `x` can be `infinite`, wrap the implementation as follows:

    ```javascript
    function check( x ) {
        return (
            x > -Infinity &&
            isNegativeInteger( x )
        );
    }

    var bool = check( -Infinity );
    // returns false
    ```

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var isNegativeInteger = require( '@stdlib/math/base/assert/is-negative-integer' );

var bool = isNegativeInteger( -5.0 );
// returns true

bool = isNegativeInteger( 0.0 );
// returns false

bool = isNegativeInteger( 1.0 );
// returns false

bool = isNegativeInteger( -3.14 );
// returns false

bool = isNegativeInteger( NaN );
// returns false
```

</section>

<!-- /.examples -->

<section class="links">

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

</section>

<!-- /.links -->