translation and distance

[Minigame]

I have been trying to figure out how to determine the distance between vector A and vector B, then use the result to determine if it is within a certain range in world space.
I have experimented and tried many various attempts for some time but.. 

Here's an example of code representing what my overall goal would be (1 of many failed attempts)

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float distanceToDestination = localPlayer.getTransformedCenter().calcSub(dest).length(); // XXX
if (distanceToDestination <= 100) {
// Here, I would translate the local player in my game <distanceToDestination> world units.
}


I've tried a lot of different solutions and I'm not really that great with these type of mathematics so any help is very much appreciated

[EgonOlsen]

What's wrong with that attempt? It looks fine to me assuming that dest ist filled with some reasonable values. Another option is to simply use

http://www.jpct.net/doc/com/threed/jpct/SimpleVector.html#distance(com.threed.jpct.SimpleVector)

but that basically does the same thing.