custom_do_something.jl

function do_something(a::Float64, b::Float64)
    println("In original do_something")
    return a+b
end
 
function do_all(a::Float64, b::Float64)
    result = 0.0
    result += do_something(a, b)
    result += custom_do_something(a, b)
    return result
end

function custom_do_something(a::Float64,b::Float64) end
export do_all, custom_do_something
 
end # of module
 
using DoSomething
 
function DoSomething.custom_do_something(a::Float64, b::Float64)
    println("In modified do_something!")
    return a*b
end
 
do_all(1.0, 2.0) # should give 5