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Can anyone explain me what is state and mutable data?

In computer science, functional programming is a programming paradigm that treats computation as the evaluation of mathematical functions and avoids state and mutable data.

http://en.wikipedia.org/wiki/Functional_programming

Can anyone explain me what is state and mutable data? Can anyone give me examples in either JAVA or JavaScript.

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Answer

mutable suggest anything that can change, i.e. an int

int a = 0;
System.out.prtinln(a); //prints 0
a = 2;
System.out.prtinln(a); //now prints 2, so its mutable

In java a string is immutable. you cannot change the string value only its reference.

String s1 = "Hello";
System.out.println(s1); //prints Hello
String s2 = s1;
s1 = "Hi";
System.out.println(s2); //prints "Hello" and not "Hi"

State is something which an instance of a class will have (an Object).

If an Object has certain values for its attributes its in a diffrent state then another Object of the same class with diffrent attribute values

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