Convert hex string to int in Crystal

Question

I want to convert an hex string value in a variable to int.

This works for a literal: "#{0xFF}".to_i

But with a var...?

Not working test (interpolation error):

_myvar = "FF"
"#{0x_myvar}".to_i

Answer 1

Why not check the API documentation for String

"FF".to_i(16)