Test if object has a certain script.

Questions & Answers
1

I want something to happen to an object IF it has a certain script on it. The code will be in affect on almost every object in the game, but this effect is only to affect those that have the script. I feel there should be an easy way to test for this, but I cannot find it.

How should I do this?

3

To correct Mike's answer, the C# version would be:

YourScript script = yourObj.GetComponent<YourScript>();
if (script != null)
{
    //do stuff with script
}

Because you always have to specify a type in C# and "var" doesn't exist in C#.

For JS version you can just use

var script = yourObj.GetComponent(YourScript);
[...]

or a bit better: when you specify a fix type in JS the access to this var is faster

var script : YourScript = yourObj.GetComponent(YourScript);
[...]

Don't forget the generic version of GetComponent doesn't work on iPhone. Generic is everything with < Type>. In C# without generic you have to use:

YourScript script = (YourScript)yourObj.GetComponent(typeof(YourScript));

or

YourScript script = yourObj.GetComponent(typeof(YourScript)) as YourScript;
2

js:

var script = yourObj.GetComponent.<YourScript>();
if (script != null)
{
    //do stuff with script
}

c#:

var script = yourObj.GetComponent<YourScript>();
if (script != null)
{
    //do stuff with script
}

Only difference is a single . but it makes it more explicit