# isNonPositiveInteger

Test if a finite double-precision floating-point number is a nonpositive integer.

## Usage

``````var isNonPositiveInteger = require( '@stdlib/math/base/assert/is-nonpositive-integer' );
``````

#### isNonPositiveInteger( x )

Tests if a finite double-precision floating-point number is a nonpositive `integer`.

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

bool = isNonPositiveInteger( 0.0 );
// returns true

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

## 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:

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

var bool = check( -Infinity );
// returns false
``````
• The function does not distinguish between positive and negative `zero`.

``````var bool = isNonPositiveInteger( 0.0 );
// returns true

bool = isNonPositiveInteger( -0.0 );
// returns true
``````

## Examples

``````var isNonPositiveInteger = require( '@stdlib/math/base/assert/is-nonpositive-integer' );

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

bool = isNonPositiveInteger( 0.0 );
// returns true

bool = isNonPositiveInteger( 1.0 );
// returns false

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

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