# isNonNegativeInteger
> Test if a finite [double-precision floating-point number][ieee754] is a nonnegative integer.
## Usage
```javascript
var isNonNegativeInteger = require( '@stdlib/math/base/assert/is-nonnegative-integer' );
```
#### isNonNegativeInteger( x )
Tests if a finite [double-precision floating-point number][ieee754] is a nonnegative `integer`.
```javascript
var bool = isNonNegativeInteger( 1.0 );
// returns true
bool = isNonNegativeInteger( 0.0 );
// returns true
bool = isNonNegativeInteger( -10.0 );
// returns false
```
## Notes
- The function assumes a **finite** `number`. If provided positive `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 &&
isNonNegativeInteger( x )
);
}
var bool = check( Infinity );
// returns false
```
- The function does **not** distinguish between positive and negative `zero`.
```javascript
var bool = isNonNegativeInteger( 0.0 );
// returns true
bool = isNonNegativeInteger( -0.0 );
// returns true
```
## Examples
```javascript
var isNonNegativeInteger = require( '@stdlib/math/base/assert/is-nonnegative-integer' );
var bool = isNonNegativeInteger( 5.0 );
// returns true
bool = isNonNegativeInteger( 0.0 );
// returns true
bool = isNonNegativeInteger( -1.0 );
// returns false
bool = isNonNegativeInteger( 3.14 );
// returns false
bool = isNonNegativeInteger( NaN );
// returns false
```
[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985