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The return value from a function is provided within the function by making an assignment to an identifier with the same name as the function. [5] However, some versions of Pascal provide a special function Exit( exp ); that can be used to return a value immediately from a function, or, without parameters, to return immediately from a procedure.
Whether or not Foo.bar(5) invokes a function or simply sets an attribute is hidden from the caller. Likewise whether Foo.bar() simply retrieves the value of the attribute, or invokes a function to compute the value returned, is an implementation detail hidden from the caller. If the language uses the attribute syntax the syntax may look like this.
A snippet of Python code with keywords highlighted in bold yellow font. The syntax of the Python programming language is the set of rules that defines how a Python program will be written and interpreted (by both the runtime system and by human readers). The Python language has many similarities to Perl, C, and Java. However, there are some ...
The keyword Sub is used to return no value and Function to return a value. When used in the context of a class, a procedure is a method. [27] Each parameter has a data type that can be specified, but if not, defaults to Object for later versions based on .NET and variant for VB6. [28]
They provide an elegant way of handling errors, without resorting to exception handling; when a function that may fail returns a result type, the programmer is forced to consider success or failure paths, before getting access to the expected result; this eliminates the possibility of an erroneous programmer assumption.
In computer science, a mutator method is a method used to control changes to a variable. They are also widely known as setter methods. Often a setter is accompanied by a getter, which returns the value of the private member variable.
In other programming languages, Scheme for example, the return value of an assignment is undefined and such idioms are invalid. In Haskell, [8] there is no variable assignment; but operations similar to assignment (like assigning to a field of an array or a field of a mutable data structure) usually evaluate to the unit type, which is ...
Many programming languages support passing and returning function values, which can be applied to arguments. Whether this suffices to call function values first-class is disputed. Some authors require it be possible to create new functions at runtime to call them 'first-class'.