You've made a spelling error:
var someAsyncFn = function() {};
someAsycFn(function() {
Your call to the function omits the letter n.
The reason it doesn't work at all is that this is not real code. It is an example. someAsyncfn is not a real function. It does nothing. var someAsyncFn = function() {}; makes a function that does nothing. It's a placeholder to describe what would happen if there was a real asynchronous function.
Something like this would show the effect in a web browser (you'd need to use a different asynchronous function in node.js; I'm using jQuery to keep the code clean).
var someAsyncFn = function(successfn) {
$.get(document.location, successfn); // make an AJAX request to the current URL, for demonstration purposes
// successfn will be called when the request succeeds
};
for (var i = 0; i < 10; i++) {
(function(j) {
someAsyncFn(function() {
console.log(j);
});
})(i);
}
This works because (a) the function containing console.log is now actually called and (b) because it is called asynchronously, when the $.get request is complete.
The whole point of this is that the code runs asynchronously, which means you won't get 0 to 9 in order; you'll get them in the order that the requests completed. For me, this was:
2
3
1
0
4
5
6
7
8
9
You will probably get a different result.
