Strings and immutability C# with Example
Immutable types are types that when changed create a new version of the object in memory, rather than changing the existing object in memory. The simplest example of this is the built-in string type. Taking the following code, that appends " world" onto the word "Hello" string myString = "hello"; myString += " world"; What is happening in memory in this case is that a new object is created when you append to the string in the second line. If you do this as part of a large loop, there is the potential for this to cause performance issues in your application. The mutable equivalent for a string is a StringBuilder Taking the following code StringBuilder myStringBuilder = new StringBuilder("hello"); myStringBuilder.append(" world"); When you run this, you are modifying the StringBuilder object itself in memory.