How best to determine if an argument is not sent to the JavaScript function

Question

I have now seen 2 methods for determining if an argument has been passed to a JavaScript function. I\'m wondering if one method is better than the other or if one is just ba

Answer 1

In ES6 (ES2015) you can use Default parameters

function Test(arg1 = 'Hello', arg2 = 'World!'){
  alert(arg1 + ' ' +arg2);
}

Test('Hello', 'World!'); // Hello World!
Test('Hello'); // Hello World!
Test(); // Hello World!