The fastest way to know if someone "did it" ...

I know I choosed a weird title, isn't it :?

Today I have two small and useful tips and tricks for JavaScript.

The first one, lets you know if someone extended the Object.prototype

if((function(k){for(k in {})return true;return false})()){
 // do stuff that care about Object prototype
} else {
 // do stuff that doesn't care about Object prototypes
}

Simple, quick, and dirty ;) and this is another example:

function didIt(k){for(k in {})return true;return false};

if(didIt()){
 // stuff prototype
}

One thing to take care about is the usage of a function instead of a variable.
Since some script could run other scripts dinamically, you can't trust in a single time check.

The second trick is really useful for function that accept a switcher argument.
For switcher argument I mean methods or function that accept true or false as argument.
The simplest way to have a switcher is obviously sending the value, but in this case we can't have a default behaviour.

Simple is to choose a "false" behaviour as default one

function addOrRemoveStuff(dontDoIt){
 if(dontDoIt){
   // someone sent a true value
 } else {
   // default behaviour, dontDoIt is false or undefined
 }
}

So what's new? Nothing, yet, but try to guess about a different default ... a true value as default ... think ... think ... think ... did you find them? :)

function addOrRemoveStuff(doIt){
 doIt = !arguments.length || !!doIt;
 if(doIt){
  // default behaviour, doIt is true
 } else {
  // someone sent a false value
 }
};

addOrRemoveStuff();      // true
addOrRemoveStuff(false); // false
addOrRemoveStuff(1);     // true

This simple thing is present, for example, in jQuery.smile method.

$("div.post, p.comments").smile();      // add smiles
$("div.post, p.comments").smile(false); // remove smiles

Enjoy these tricks, and this week end as well :)

JSmile for jQuery ;)

As I said one post ago, I've created a jQuery dedicated version of my simple JSmile project :geek:

Here you can find the demo page, qhle here the automatic generated source

What's new?
It's so simple

$(function(){
 $(document.body).smile();
});

Use $("one or more smiles containers").smile(true or false) to add/remove smiles from your pages.

See you ;)

jQuery minor improvements

Update
This post has an "official" link, now, directly in devpro :)
--------------

These are just few fixes / improvements of some jQuery stuff.

(function(o){for(var k in o)jQuery[k] = o[k]})({

 // IMPROVED: Evalulates a script in a global context using a specified JS version, if any
 globalEval: function( data, version ) {
  /** Examples
  $.globalEval("let(a = 1)alert(a);");  // error
  $.globalEval("let(a = 1)alert(a);", 1.7); // OK, alert 1

  (function(){
   var test = 1;
   $.globalEval("test = 2");
   alert(test); // 1
  })();
  alert(test);  // 2
  */
  data = jQuery.trim( data );
  if ( data ) {
   var script = document.createElement("script");
    script.type = "text/javascript";
   if ( version )
    script.type += ";version=" + version;
   if ( jQuery.browser.msie )
    script.text = data;
   else
    script.appendChild( document.createTextNode( data ) );
   with(document.getElementsByTagName("head")[0] || document.documentElement)
    removeChild( appendChild( script ) );
  }
 },
 
 // IMPROVED: optional strict comparation
 inArray: function( elem, array, deep ) {
  for ( var i = 0, length = array.length; i < length; i++ )
   if ( (deep && array[ i ] === elem) || (!deep && array[ i ] == elem) )
    return i;

  return -1;
 },
 
 // FIXED: ( typeof array != "array" ) .... excuse me ???
 makeArray: function( array ) {
  if(array instanceof Array)
   var ret = array.slice();
  else
   for(var ret = [], i = 0, length = array.length; i < length; i++)
     ret[i] = array[i];
  return ret;
 }

});

Next post will be about my define function for jQuery, a typeOf suggestion, and finally JSmile integrated in jQuery ... so please, stay tuned :)