function isComplex( value ) {
	var type;
	if ( value instanceof Complex128 || value instanceof Complex64 ) {
		return true;
	}
	type = constructorName( value );
	return ( type === 'Complex64' || type === 'Complex128' );
}
Tests if a value is a 64-bit or 128-bit complex number.

@param {*} value - value to test
@returns {boolean} boolean indicating if a value is a 64-bit or 128-bit complex number

@example
var Complex128 = require( '@stdlib/complex/float64/ctor' );
var Complex64 = require( '@stdlib/complex/float32/ctor' );

var x = new Complex128( 4.0, 2.0 );
var bool = isComplex( x );
// returns true

x = new Complex64( 4.0, 2.0 );
bool = isComplex( x );
// returns true