Writing Your Own Function

Intermediate Julia

Anthony Markham

Quantitative Developer

Structs recap

Structs are an application of composite types.
These are like other types, but with as many fields as you want.

mutable struct House
    bedrooms::Int64
    bathrooms::Int64
    location::String
    price::Float64
end

my_house = House(3, 2, "Sydney", 1500000)

Common in many programming languages for solving real-world problems.

Functions and custom structs

mutable struct Person
    age::Int64
    height::Int64
    location::String

    function Person(age, height)
        new(age, height, "London")
    end
end

steve = Person(19, 180)

Person(19, 180, "London")

Functions recap

How to pass different argument types into a function

function arg_types(pos, ; key)
    return pos, key
end

how to pass a variable amount of arguments into a function

function vararg_names(names...)
    return names
end

how to return output from a function

function return_x_times_y(x, y)
    return x * y
end

Functions are flexible and writing your own functions is an essential part of programming.
Practical, real-world problem solving is a key part of learning to code.

Let's practice!

Intermediate Julia