Overriding
With the local scope of a function, you also start to deal with overriding. Overriding represents the circumstance when a value of one accessible scope has precedence over a similarly named value within another accessible scope. With function calls, you have two readily accessible scopes obtained through direct reference of variable names, the timeline scope and the local scope of the function. The local scope has precedence over the scope of the timeline so if a value in the local scope of a function shares the same variable name of a value in the timeline, the local variable’s value will be retrieved when that variable is accessed. For example

num = 1;
 

traceNum = function(){

trace(num); // traces 1

var num = 5;

trace(num); // traces 5

};
 

traceNum();

trace(num); // traces 1

You will see more with overriding later on. It can play an important role in OOP.

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