B4J Question String Concatenation

[mindful]

Which method offers the best performance to join together two strings ?
1.

Dim finalString As String = String1 & String2

2.

Dim finalString As String = $"${String1}${String2}"$

3.

Dim sb As StringBuilder
sb.Initialize
sb.Append(String1)
sb.Append(String2)
Dim finalString As String = sb.ToString

I am looking for a method that will be used in general (short, long, very long strings which are made from 2 strings or more) ... for now I am using the 1st and the 2nd but I saw a post (can't find it) that suggested that for long strings composed of many parts (not just two) it is performance wise to use the 3rd method ...

 

[EnriqueGonzalez]

Hi!

The post you are looking was between erel and ilan and erel demonstrated that stringbuilder is 10 times faster than the other 2 methods.

You may not find the post because it was on the chit chat section

 

[Erel]

For a few strings the difference will not matter. If there are many concatenations then you should definitely use StringBuilder.

The relevant discussion: https://www.b4x.com/android/forum/threads/get-a-random-string.75903/#post-481749 (StringBuilder is 100 times faster).