isNegativeInteger

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

Usage

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

isNegativeInteger( x )

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

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

bool = isNegativeInteger( 0.0 );
// returns false

bool = isNegativeInteger( 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 &&
          isNegativeInteger( x )
      );
  }
  
  var bool = check( -Infinity );
  // returns false

Examples

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

---

See Also

• @stdlib/math/base/assert/is-integer: test if a finite double-precision floating-point number is an integer.
• @stdlib/math/base/assert/is-nonnegative-integer: test if a finite double-precision floating-point number is a nonnegative integer.
• @stdlib/math/base/assert/is-nonpositive-integer: test if a finite double-precision floating-point number is a nonpositive integer.
• @stdlib/math/base/assert/is-positive-integer: test if a finite double-precision floating-point number is a positive integer.