The old advice is not valid anymore

Since I just read again the advice to always use StringBuilder instead of String concatenation, we will close this chapter once and for all, right now!

Long story short, using StringBuilder instead of String concatenation is just an old myth. In most cases, it is not true anymore. You can safely do a String1 + String2 in your code, and you won’t notice any difference. There are only a few special cases where a StringBuilder is a must.

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