Natalie Cluer18,886 Points
undefined vs null?
Why do we pass in undefined as a parameter? what would the difference be between passing in undefined vs passing in null?
Stuart Wright41,069 Points
By using undefined, you are telling the function that you are choosing not to pass an argument in for name, so it knows to use the default value. By passing in null, you are telling it that you are passing in the value null as your name argument.
greet(undefined, 'Afternoon'); > Good Afternoon, Guil!
greet(null, 'Afternoon'); > Good Afternoon, null!