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When a function is called, the arguments in a function can be passed by value or passed by reference. Callee is a function called by another and the caller is a function that calls another function (the callee). The values that are passed in the function call are called the actual parameters.
Arguments are passed by value. When invoked, a method or a constructor receives the value of the variable passed in. When the argument is of primitive type, "pass by value" means that the method cannot change its value.
Java is officially always pass-by-value. The question is, then, “what is passed by value?” As we have said in class, the actual “value” of any variable on the stack is the actual value for primitive types (int, float, double, etc) or the reference for reference types.
Pass-by-reference means to pass the reference of an argument in the calling function to the corresponding formal parameter of the called function. The called function can modify the value of the argument by using its reference passed in. The following example shows how arguments are passed by reference.
Can anyone expand upon, correct, or verify what I feel is happening when you pass arguments to a method in Ruby. Are any of these points wrong? Am I missing any pieces?
Is there any way to have a method that takes as one of its parameters an Integer, does some stuff, and maybe as a side effect changes the value, having that change reflected once the method exits. Maybe I am just not thinking "the Ruby way".
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