Anonymous Function Term Meaning

Mariusz Postol

A fundamental problem is the meaning of the anonymous function term. In software engineering, procedure, function, and method terms refer to a parameterized sequence of instructions. By design, a procedure is a parametrized sequence of instructions that performs a specific task by applying provided parameters. It does not return a value. It can be recognized as a custom structural statement. A function is a similar language construct to a procedure but is designed to return a value as a result of execution. Hence, in the sequence instructions, there must be a return instruction ending the sequence execution and returning calculated values. Methods could be recognized as programming language constructs used in both roles, namely function or procedure. In strongly typed languages, if a method is used in the procedure role instead of the type of returned value a special keyword is used, for example, void. All of them could be defined in declarations associating the definition with a unique in the selected context name. For procedures, an invocation statement can be defined by a programming language. Functions may be used as operands in expressions. If there is no declaration associating the name the structural statement must be recognized as anonymous. A reference pointing out the structural statement must be used to be invoked instead of a name. In this context, we may talk about anonymous procedures, functions, or methods. Concluding this we have to ask:

what is the origin of the term anonymous function?
what is the meaning of the term anonymous function?

3 Replies

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Mariusz Postol11mo ago
I am attempting to address this and many other questions in my preprint, titled "Toward Functional Programming." It has DOI: 10.22541/au.175915460.00864426/v1 and you can check it out using the following link:
Please let me know if you have any questions or concerns.

Mariusz Postol1y ago

@Jayraj Chhaya, thanks for your contribution. You said, "functions that are defined without a name." Can we also define procedures without a name? From this example

we can state that the anonymous function is an expression evaluated as a delegate value comprising a reference to the named method. Do you agree?

Beter example is in the following code snippet:

    [TestMethod]
    public void AnonymousMethodCallBackTest()
    {
      AnonymousFunctions _newInstance = new AnonymousFunctions();
      bool _testResult = false;
      AnonymousFunctions.CallBackTestDelegate _CallBackTestResult = delegate (bool _result) { _testResult = _result; };
      //void _CallBackTestResult(bool _result) { _testResult = _result; }
      _newInstance.ConsistencyCheck(_CallBackTestResult);
      Assert.IsTrue(_testResult);
    }

Again

delegate (bool _result) { _testResult = _result; }

is an expression evaluated as a delegate value comprising a reference to the method without the name?

Jayraj Chhaya1y ago
The term "anonymous function" originates from the concept of functions that are defined without a name. In programming, an anonymous function is a function that is not bound to an identifier, allowing it to be used as a first-class citizen in various contexts, such as callbacks or higher-order functions. This contrasts with named functions, which are explicitly declared and can be invoked by their name.

Anonymous functions are particularly useful in functional programming paradigms, where they enable concise and flexible code. For instance, in JavaScript, an anonymous function can be defined as follows:
```
const add = function(a, b) {
    return a + b;
};
```
The function does not have a name but can still be assigned to a variable and invoked. The significance of anonymous functions lies in their ability to encapsulate behavior without cluttering the global namespace, promoting cleaner and more maintainable code.