I’m sure there’s still some junior .NET devs using + to concatenate large (usually an unknown) amounts of strings?
Look at that memory allocation 😲 …
Click on the image for a larger view in a new window.
Why such a big difference?
Well of course strings are immutable in .NET.
To quote Microsoft …
The String object is immutable. Every time you use one of the methods in the System.String class, you create a new string object in memory, which requires a new allocation of space for that new object. In situations where you need to perform repeated modifications to a string, the overhead associated with creating a new String object can be costly.