Easiest way to check if string is null or empty

Question

I\'ve got this code that checks for the empty or null string. It\'s working in testing.

eitherStringEmpty= (email, password) ->
  emailEmpty = not email? or          


        

Answer 1

I think the question mark is the easiest way to call a function on a thing if the thing exists.

for example

car = {
  tires: 4,
  color: 'blue' 
}

you want to get the color, but only if the car exists...

coffeescript:

 car?.color

translates to javascript:

if (car != null) {
  car.color;
}

it is called the existential operator http://coffeescript.org/documentation/docs/grammar.html#section-63