how to check numbers of arguments in a method javasscript code example

Example: javascript x number of parameters

function display_numbers(...numbers) {
	colors.forEach(function(x) {
  		console.log(x);
	});
}

// call it like:
display_numbers(1)
display_numbers(1, 2, 3, 4)
display_numbers(1, -1, 9, 0, 2)