Julia: Function as an argument to other function

In Julia, you can pass a function as an argument to other function. Following snippet pass the function sum as an argument to the function process_data.

julia> function sum(a, b)
           a+b
       end
sum (generic function with 2 methods)

julia> function process_data(f, a, b)
           f(a, b)
       end
process_data (generic function with 1 method)

julia> process_data(sum, 10, 20)
30

julia> process_data(sum, 10, 2000)
2010

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