CoffeeScript do, pass argument

Question

The following CoffeeScript code:

do (a) ->
    console.log a

generates this:

(function(a) {
  return console.log(a);
})(a);

How do I pass a value to a like this?

(function(a) {
  return console.log(a);
})("hello");

Answer 1

do (a = 'hello') ->
  console.log a

Will generate exactly what you want.

Though, i have to admit that i can't see the point of doing that. If you really want a to take the literal value 'hello' inside that scope, then why make another scope? With a being a normal variable declared as a = 'hello' will be enough. Now, if you want to replace a with the value of another variable (that might change in a loop or something) and do do (a = b) -> then i think it makes more sense, but you could simple do do (a) -> and just use a instead of b inside the do scope.