Book Image

Julia 1.0 Programming Complete Reference Guide

By : Ivo Balbaert, Adrian Salceanu
Book Image

Julia 1.0 Programming Complete Reference Guide

By: Ivo Balbaert, Adrian Salceanu

Overview of this book

Julia offers the high productivity and ease of use of Python and R with the lightning-fast speed of C++. There’s never been a better time to learn this language, thanks to its large-scale adoption across a wide range of domains, including fintech, biotech and artificial intelligence (AI). You will begin by learning how to set up a running Julia platform, before exploring its various built-in types. This Learning Path walks you through two important collection types: arrays and matrices. You’ll be taken through how type conversions and promotions work, and in further chapters you'll study how Julia interacts with operating systems and other languages. You’ll also learn about the use of macros, what makes Julia suitable for numerical and scientific computing, and how to run external programs. Once you have grasped the basics, this Learning Path goes on to how to analyze the Iris dataset using DataFrames. While building a web scraper and a web app, you’ll explore the use of functions, methods, and multiple dispatches. In the final chapters, you'll delve into machine learning, where you'll build a book recommender system. By the end of this Learning Path, you’ll be well versed with Julia and have the skills you need to leverage its high speed and efficiency for your applications. This Learning Path includes content from the following Packt products: • Julia 1.0 Programming - Second Edition by Ivo Balbaert • Julia Programming Projects by Adrian Salceanu
Table of Contents (18 chapters)

Basic input and output

Julia's vision on input/output (I/O) is stream-oriented, that is, reading or writing streams of bytes. We will introduce different types of stream, file streams, in this chapter. Standard input (stdin) and standard output (stdout) are constants of the TTY type (an abbreviation for the old term, Teletype) that can be read from and written to in Julia code (refer to the code in Chapter 8\io.jl):

  • read(stdin, Char): This command waits for a character to be entered, and then returns that character; for example, when you type in J, this returns 'J'
  • write(stdout, "Julia"): This command types out Julia5 (the added 5 is the number of bytes in the output stream; it is not added if the command ends in a semicolon ;)

stdin and stdout are simply streams and can be replaced by any stream object in read/write commands. readbytes is...