is-nonpositive-integer

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