Facets of Immutability

Immutability, the cornerstone of functional programming, has many facets.

Not every (mainstream) language supports all the facets; at least not per what each facet stands for. That’s what I will talk about today. The various facets of immutability from a theoretical perspective, and briefly show how some of the mainstream languages have adopted and support these facets in their own way.

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final, const and beyond

What are your thoughts on the following piece of code?

public String someGibberishMethod() {
    int length = someMethodReturningLength();
    int sum = 0;

    for (int index = 0; index < length; ++index) {
       // some code that updates the sum variable
    }

    SomeClass someClass = new SomeClass(sum);
    int sumValueInsideSomeClass = someClass.getSumValue();
    // use someText, maybe log or something

    String someText = someClass.doSomeOperation(/*some parameters*/);
    // use someText, maybe log or something
    return someText;
}

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