Aug
19

Javascript – Stupid Idea: Hoisting at the end

vjeux Javascript 2011-08-19

JSLint imposes us to do manual hoisting of variables. What if we did it but at the end of the function? 😛

How you write

function print_array (array) {
  var length = array.length;
  for (var i = 0; i < length; ++i) {
    var elem = array[i];
    console.log(elem);
  }
}

How Javascript "rewrites" it

function print_array (array) {
  var length, elem, i;
 
  length = array.length;
  for (i = 0; i < length; ++i) {
    elem = array[i];
    console.log(elem);
  }
}

How we could write it!

function print_array (array) {
  length = array.length;
  for (i = 0; i < length; ++i) {
    elem = array[i];
    console.log(elem);
  }
 
  var length, elem, i;
}

I have no idea if that could be of any use but it amused me 🙂

If you liked this article, you might be interested in my Twitter feed as well.
 
All Posts
«
»
 

Related Posts

  • October 12, 2011 Hook document.CreateElement (5)
    For a project I will talk later on, I need to hook the function document.createElement. The code I wanted to write was: var original = document.createElement; document.createElement = function (tag) { // Do something return original(tag); }; Problem However, there's a […]
  • September 22, 2011 URLON: URL Object Notation (43)
    #json, #urlon, #rison { width: 100%; font-size: 12px; padding: 5px; height: 18px; color: #560061; } I am in the process of rewriting MMO-Champion Tables and I want a generic way to manage the hash part of the URL (#table__search_results_item=4%3A-slot). I no longer […]
  • September 24, 2011 Javascript: Cyclic Object Detection (17)
    URLON.stringify() suffer from a problem, when passed an object that contains a cycle, it will never stop. This article shows 3 techniques in order to detect if an object is cyclical. Edit the object: Mark In order to detect a cycle in an object, the method we learn at school is to […]
  • September 25, 2011 Javascript Object Difference (8)
    This article is about a difference algorithm. It extracts changes from one version of an object to another. It helps storing a smaller amount of information. Template In a project, I have a template object with all the default settings for a widget. var template = { […]
  • August 29, 2011 Javascript: Improve Cache Performance: Reduce Lookups (4)
    In my Binary Decision Diagram Library, the performance bottleneck was the uniqueness cache. By reducing the number of cache lookup, it is possible to greatly improve the performances. Common pattern In order to test if the key is already in the cache, the usual pattern is to use key […]
Sovrn