How to pass parameter list to a function in Julia

Question

I am newbie in Julia language, and the tutorial is not very deep yet and I didn\'t understand what is the best way to pass a parameter list of a function. My function looks like

Answer 1

The idiomatic solution would be to create a type to hold the parameters and use multiple dispatch to call the correct version of the function.

Here's what I might do

type Params
    a::TypeOfA
    b::TypeOfB
    c::TypeOfC
end

function dxdt(x, p::Params)
    p.a*x^2 + p.b*x + p.c
end

Sometimes if a type has many fields, I define a helper function _unpack (or whatever you want to name it) that looks like this:

_unpack(p::Params) = (p.a, p.b, p.c)

And then I could change the implementation of dxdt to be

function dxdt(x, p::Params)
    a, b, c = _unpack(p)
    a*x^2 + b*x + c
end