Interactive development



When redefining a subfunction I always have to go back and redefine the top level function since otherwise it continues to use the old definition of the subfunction. Is there a way around this? I have played with @noinline and starting julia with --optimise=0 but it doesn’t seem to help. The REPL session below illustrates what I am talking about.

julia> a()=b()
a (generic function with 1 method)

julia> b()=1
b (generic function with 1 method)

julia> a()

julia> b()=2
WARNING: Method definition b() in module Main at REPL[2]:1 overwritten at REPL[4]:1.
b (generic function with 1 method)

julia> a()

FAQ subcategory

What you are seeing is #265 in action. From what I now this is slated to be fixed in Julia v0.6, but until then there is no good workaround.


Ah thanks. Do you know if the idea of an interpreted mode (rather than JIT) has ever been explored?


There is an interpreter already, but it is relatively slow, and doesn’t yet support all intrinsics (see


Note that interpreting code is not related to fixing #265 at all.


Relevant FAQ entry here (mostly second half).


In IJulia, I use this macro:

macro autorun(expr)

@autorun a()=b()
@autorun b()=1

a()    # 1

@autorun b()=2

a()    # 2

It’s a hack, but it works.