A classic trap for new players is that in most modern compiled languages you can add strings and get a string, but strings are in fact immutable and can't be added without making an entirely new string and disposing of the original two. This means "a" + "b" is actually a horrible way to build up a string if you have to do lots of little additions, so most languages have some other method of making a string of strings/chars (StringBuilder in Java and C#, strings.Builder in Go, etc).
A classic trap for new players is that in most modern compiled languages you can add strings and get a string, but strings are in fact immutable and can't be added without making an entirely new string and disposing of the original two. This means "a" + "b" is actually a horrible way to build up a string if you have to do lots of little additions, so most languages have some other method of making a string of strings/chars (StringBuilder in Java and C#, strings.Builder in Go, etc).