isInteger

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

Usage

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

isInteger( x )

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

var bool = isInteger( 1.0 );
// returns true

Notes

  • The function assumes a finite number. If provided positive or 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 &&
            x > -Infinity &&
            isInteger( x )
        );
    }
    
    var bool = check( Infinity );
    // returns false
    
    bool = check( -Infinity );
    // returns false
    

Examples

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

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

bool = isInteger( 3.14 );
// returns false

bool = isInteger( NaN );
// returns false