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Programming tip of the day – Mutable and Immutable

Immutable -> Once a variable has been assigned its value, value cannot be modified in the same memory location.  It allocates a new memory space and then puts the modified contents into that variable.

Mutable -> Variable’s value can be modified in the same memory location.

 

Eg.  String in C# and VB.NET is immutable, StringBuilder is mutable.

String cont = “1”;

cont = cont + ” 2″; //Allocates new memory and adds value ” 2″ inside it

StringBuilder builder = new StringBuilder(“1″);

builder.add(” 2″); //Modifies the value in the same location.

 

 Moral: For strings that require constant change/modification, use StringBuilder (C#) for better performance.

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