ReusableFunctions

import Pkg; Pkg.add("ReusableFunctions")

import ReusableFunctions
function f(x)
    @info("function f is executed!")
    sleep(1)
    return x
end
f_reuse = ReusableFunctions.maker3function(f);

julia> f(1) # normal function call
[ Info: function f is executed!
1

# function call using ReusableFunctions function
# the first time f_reuse() is called the original function f() is called
julia> f_reuse(1)
[ Info: function f is executed!
1

# function call using ReusableFunctions function
# the second time f_reuse() is called the original function f() is NOT called
# the already stored output from the first call is reported
julia> f_reuse(1)
1