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  3. Intermediate Julia
  • 1

    Loops and Ranges

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    Loops are one of the core concepts that underpin Julia. In this chapter, you'll learn about for loops and while loops, and how to use them to iterate over data structures that you are already familiar with. You will also cover ranges, a useful tool for generating sequences of data.

  • 2

    Data Structures

    This chapter focuses on expanding your knowledge of the data structures available in Julia. Learn how to use tuples, dictionaries, multi-dimensional arrays, and structures to store and traverse data quickly and efficiently.

  • 3

    Advanced Functions in Julia

    In this chapter, you’ll extend your understanding of functions, exploring positional, keyword, and default function arguments. You will also cover code execution timing, getting a strong understanding of how to measure the time your code takes to run. This chapter will round off with a capstone on writing your own functions to solve real-world problems.

  • 4

    Dataframe Operations and Python/R Packages in Julia

    This final chapter will introduce anonymous functions and will recap one of the powerful features of Julia; multiple dispatch. You will learn how to use functions from Python and R packages within Julia and discover how to clean and modify data within dataframes.

Initializing

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Writing your own functions

You've seen how to write functions. Now it's time to practice and write your own. In this exercise, you'll be writing a function to calculate the cost of a customer's order. Pre-defined is a dictionary restaurant_menu with menu items as keys and their corresponding prices as values, and you, as the restaurant owner, want to use this dictionary mapping to calculate the total price of a customer's order.

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  • The first step here is to define a function called calculate_order_cost, which should take an unlimited number of arguments called items, as customers can order as much as they want!