When function is called by passing a copy of the value of the arguments is called?
LotusScript® provides two ways to pass arguments to functions and subs: When you pass an argument by reference, you pass a pointer to the value in memory. The function operates on the argument. When a function changes the value of an argument passed by reference, the original value changes. When you pass an
argument by value, you pass a copy of the value in memory. The function operates on the copy. This means that when a function changes the value of an argument passed by value, the effect is local to that function; the copy changes but the original value in memory is not affected. Whether an argument is passed by reference or by value depends on the data type and other characteristics of the argument:
Note: An array parameter should not be declared as "ByVal"; a Function or Procedure call should not have parentheses around an array argument.
Passing by referenceThe variable must have the same data type as the corresponding parameter in the function definition, unless the parameter is declared as Variant or is an object variable. An object variable can be passed to an object of the same, base, or derived class. In the latter, the base class must contain an instance of the derived class or a class derived from the derived class. If the variable is then modified by the function or sub, the variable has the modified value when the function or sub returns. Passing by valueYou can do the following:
A value passed to a function or sub is automatically converted to the data type of the function or sub argument if conversion is possible. A Variant argument will accept a value of any built-in data type; and any list, array, or object. A Variant argument will not accept a value of a user-defined type. Keep in mind, however, that lists, arrays, objects, and user-defined types cannot, and therefore should not, be passed by value. If the variable argument is then modified by the function or sub, the variable has its original value after the function or sub returns. The function or sub operates only on the passed copy of the variable, so the variable itself is unchanged. ExamplesExample 1
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Example 4
What is it called when you pass a function as an argument?Because functions are objects we can pass them as arguments to other functions. Functions that can accept other functions as arguments are also called higher-order functions. In the example below, a function greet is created which takes a function as an argument.
What is passing the value of an argument to a method?Pass-by-value means that when you call a method, a copy of each actual parameter (argument) is passed. You can change that copy inside the method, but this will have no effect on the actual parameter. Unlike many other languages, Java has no mechanism to change the value of an actual parameter.
What is called when an object is passed by value into a function?Pass By Value: In Pass by value, function is called by directly passing the value of the variable as an argument. So any changes made inside the function does not affect the original value. In Pass by value, parameters passed as an arguments create its own copy.
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