Is it ok to have following code structure?
lib.jl
report(message) = println("Report: ", message)
prepare_data() = "data"
main.jl
includet("./lib.jl") # Revise.includet
# Some config top level variables
config = "config"
doc_before = "Some readme doc..."
# Some functions
compute(data) = "computed data"
# Main script
report(doc_before)
data = prepare_data()
computed = compute(data)
report("Computed successfully: $computed")
report("Finished")
I heard that having top level variables may reduce Julia computation speed and compilation and re-compilation speed.
Also Revise used in ~/.julia/config/startup.jl and interactive mode with VS Code REPL and Shift+Enter used.
Answer
Yeah it’s totally fine to use top-level variables in a simple Julia script like that — especially for configs and basic flow. But if you’re doing performance-heavy stuff or using Revise a lot, it’s better to wrap things in a main() function and maybe use const for fixed values. Helps with compile times and avoids weird recompile issues. But for most scripts, you're good!