ActionScript 2.0 Language Reference - Adobe Help and Support

You can use the following ActionScript to loop over all objects in the _root scope, which is
useful for debugging:
for (i in _root) {
trace(i+": "+_root[i]);
}
You can also use the array access ([]) operator on the left side of an assignment statement to
dynamically set instance, variable, and object names:
employee_array[2] = "Sam";
See also
Array, Object, eval function
= assignment operator
expression1 = expression2
Assigns the value of expression2 (the parameter on the right) to the variable, array element,
or property in expression1. Assignment can be either by value or by reference. Assignment
by value copies the actual value of expression2 and stores it in expression1. Assignment by
value is used when a variable is assigned a number or string literal. Assignment by reference
stores a reference to expression2 in expression1. Assignment by reference is commonly
used with the new operator. Use of the new operator creates an object in memory and a
reference to that location in memory is assigned to a variable.
Availability: ActionScript 1.0; Flash Player 4 - In Flash 4, = is a numeric equality operator. In
Flash 5 or later, = is an assignment operator, and the == operator is used to evaluate equality.
Flash 4 files that are brought into the Flash 5 or later authoring environment undergo a
conversion process to maintain data type integrity.
Flash 4 file: x = y
Converted Flash 5 or later file: Number(x) == Number(y)
Operands
expression1 : Object - A variable, element of an array, or property of an object.
expression2 : Object - A value of any type.
Returns
Object - The assigned value, expression2 .
Operators 141