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21 Apr

Searching Array using Array.indexOf() function

Posted by Naresh Khokhaneshiya in Uncategorized. Tagged: , , .

Searching in Array using Array.indexOf() function is very easy :) . For example,

var toys:Array = new Array();
toys.push("ball");
toys.push("bat");
toys.push("glows");
toys.push("pads");
toys.push(23);
toys.push(14);

var searchIndex:int = toys.indexOf(“ball”);
if(searchIndex == -1)
{
trace(“No! how can it be there”);
}
else
{
trace(“Yup! it’s there”); //output will be from here
}

So, it works fine when the value inside the indexed array is primitive – i.e. Number, String, Boolean etc. BUT it will not work when array contains objects of type Object. For example,

var toys:Array = new Array();
toys.push({name:"ball", count:2});
toys.push({name:"bat", count:2});
toys.push({name:"glows", count:2});
toys.push({name:"pads", count:2});
toys.push({name:"runs", count:200});
toys.push({name:"wickets", count:2});

var searchIndex:int = toys.indexOf({name:”ball”, count:2});
if(searchIndex == -1)
{
trace(“No! how can it be there”); //output will always be from here if you search an object
}
else
{
trace(“Yup! it’s there”);
}

So, that’s the case for objects. In the syntax of Array.indexOf(itemToSearch:*, fromIndex:int = 0), we notice that the first argument is * data type – i.e. it can be any data type, BUT it’s not working for Object. Would any one have lights on this?

2 Responses to this post.

  1. Posted by My Poker Blog on May 17, 2009 at 7:19 pm

    New to the blog and wanted to say great blog so far and I am looking forward to reading more and posting some comments of my own. Check my blog if you want, I log all my Poker Session there. Got feedback, post a comment :)

    Reply

  2. Posted by Tommyka on October 1, 2009 at 10:37 pm

    hey, just came across you blog looks good.

    the reason
    var searchIndex:int = toys.indexOf({name:”ball”, count:2});
    dossent work is becourse object are handled as instances, so if you keep another reference to the object you will get the right result.

    here is a little example
    var sp1:Sprite = new Sprite();
    var sp2:Sprite = new Sprite();
    var sp3:Sprite = new Sprite();

    var arr:Array = [sp1, sp2, sp3];
    trace(arr.indexOf(sp2));

    her i have a referance to my sprites so i can check with the same instance.

    Reply

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