Julia: functions

Function is blocks of statements that take zero or more arguments, do processing and return none, one or more values.

Syntax

function f(arg1, arg2,...argN)

  # Do some processing

end

julia> function sum(a,b)
           return a+b
       end
sum (generic function with 1 method)

julia> print(sum(10,20))
30
julia> print(sum(10,23))
33

Function is an object in Julia, so you can assign function to any variable and use it.

julia> addition=sum
sum (generic function with 1 method)

julia> addition(1,3)
4

julia> addition(1,33)
34

If the body of the function contains only one expression, then you can define function in compact way like below.

julia> sum(x,y,z)=x+y+z
sum (generic function with 2 methods)

julia> sum(10,20,30)
60

Note:

a.   All the arguments to function other than numbers and characters are passed by reference. So changes to the arguments inside a function reflect outside also.

b.   You can use Unicode characters also as function names.

julia> ∑(x,y,z) = x + y +z
∑ (generic function with 1 method)

julia> ∑(10, 20, 30)
60

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