why not go? why only js or c# or scala?

You can go with go. It's a matter of platform and use case over language.

You wouldn't write an android app in C#.

@kevbost cleache xamarian c# ios andriod done. thanks. I am curious abt backend and devrant

@kevbost C# is like 80% identical to Java, and has better genetics support, so if it ran on the ART it would be a decent language for android development.

Why not Go?
Go is a great language!
It's just a shame that most industries want something object oriented nowadays.
JS runs in the browser, and is OO.
C# pleases the windows crowd, and is OO.
Scala rubs the FP people the right way, and is OO.

Go isn't OO, it's procedural with method-like struct functions.

Because there are very few go developers and nobody wants to look for a programmer and can't find one. Also most programmers use popular languages because it's easier to find answers to a problem.