[nur0n]

I love how easy it is to view the machine code for a function. Julia actually ships with a handful of these introspection macros: https://docs.julialang.org/en/v1/devdocs/reflection/#Interme.... They are invaluable when it comes to optimization.

[stabbles]

Indeed, inspecting typed code, lowered code, llvm ir, and native code from the REPL is great. Combine that with @benchmark for microbenchmarking and it's amazing.

Note that the 'manual dispatch' is optimized out in a very early stage:

    julia> @code_typed foo(1)
    CodeInfo(
    1 ─     return 2
    ) => Int64

So, no need to look at assembly here.

[g0wda]

Prof. Alan Edelman gave a nice lecture about this a couple of days ago https://www.youtube.com/watch?v=IuOXXQR7dAo