Coffeescript --- How to create a self-running anonymous function?

Question

How to write this in coffeescript?

f = (function(){ // something })(); 

Thanks for any advice :)

Answer 1

Although you can simply use parentheses (e.g. (-> foo)() , you can avoid them with the do keyword:

 do f = -> console.log 'this runs right away' 

The most common use of do is to capture variables in a loop. For example,

 for x in [1..3] do (x) -> setTimeout (-> console.log x), 1 

Without do you simply print the value of x after the loop 3 times.

Answer 2

If you want the "alias" arguments passed to the self-invoking function in CoffeeScript, and let this be exactly what you are trying to achieve:

 (function ( global, doc ) { // your code in local scope goes here })( window, document ); 

Then do (window, document) -> will not let you do this. The path to go goes with partners then:

 (( global, doc ) -> # your code here )( window, document ) 

Answer 3

It's funny easy in coffee:

 do -> 

will return

 (function() {})(); 

Answer 4

try using

 do ($ = jQuery) -> 

Answer 5

You can also combine the do keyword with the default function parameters to cut out recursive "self-initializing functions" with the initial value. Example:

 do recursivelyPrint = (a=0) -> console.log a setTimeout (-> recursivelyPrint a + 1), 1000 

Answer 6

 do -> #your stuff here 

This will create a self-closing which is useful for defining scope.

Answer 7

Sorry, I decided:

 f = ( () -> "something" )() 

Answer 8

It should be

 f = () -> # do something