Coffeescript --- How to create a self-initiating anonymous function?
JavascriptJavascript FrameworkCoffeescriptJavascript Problem Overview
How to write this in coffeescript?
f = (function(){
// something
})();
Thanks for any tips :)
Javascript Solutions
Solution 1 - Javascript
While you can just use parentheses (e.g. (-> foo)(), you can avoid them by using the do keyword:
do f = -> console.log 'this runs right away'
The most common use of do is capturing variables in a loop. For instance,
for x in [1..3]
do (x) ->
setTimeout (-> console.log x), 1
Without the do, you'd just be printing the value of x after the loop 3 times.
Solution 2 - Javascript
If you want to "alias" the arguments passed to self-invoking function in CoffeeScript, and let's say this is what you are trying to achieve:
(function ( global, doc ) {
// your code in local scope goes here
})( window, document );
Then do (window, document) -> won't let you do that. The way to go is with parens then:
(( global, doc ) ->
# your code here
)( window, document )
Solution 3 - Javascript
it's ridiculous easy in coffee:
do ->
will return
(function() {})();
Solution 4 - Javascript
try to use
do ($ = jQuery) ->
Solution 5 - Javascript
You can also combine the do keyword with default function parameters to seed recursive "self-initiating functions" with an initial value. Example:
do recursivelyPrint = (a=0) ->
console.log a
setTimeout (-> recursivelyPrint a + 1), 1000
Solution 6 - Javascript
do ->
#your stuff here
This will create a self executing closure, which is useful for scoping.
Solution 7 - Javascript
Apologies, I solved it:
f = (
() -> "something"
)()
Solution 8 - Javascript
It should be
f = () ->
# do something