[julia-users] How does "pass-by-sharing" work exactly?

[Kaj Wiik]

As a new user I was surprised that even if you change the value of function 
arguments (inside the function) the changes are not always visible outside 
but in some cases they are.

Here's an example:

function vappu!(a,b)
       a[3]=100
       b = b .+ 5
       (a,b)
end

c = [1:5]
d = [1:5]

vappu!(c,d)
([1,2,100,4,5],[6,7,8,9,10])

c
5-element Array{Int64,1}:
   1
   2
 100
   4
   5
d
5-element Array{Int64,1}:
 1
 2
 3
 4
 5


Should I loop over arrays explicitly, what is happening in b = b .+ 5 ?

Thanks,
Kaj