Book Image

Learning Julia

By : Anshul Joshi, Rahul Lakhanpal
Book Image

Learning Julia

By: Anshul Joshi, Rahul Lakhanpal

Overview of this book

Julia is a highly appropriate language for scientific computing, but it comes with all the required capabilities of a general-purpose language. It allows us to achieve C/Fortran-like performance while maintaining the concise syntax of a scripting language such as Python. It is perfect for building high-performance and concurrent applications. From the basics of its syntax to learning built-in object types, this book covers it all. This book shows you how to write effective functions, reduce code redundancies, and improve code reuse. It will be helpful for new programmers who are starting out with Julia to explore its wide and ever-growing package ecosystem and also for experienced developers/statisticians/data scientists who want to add Julia to their skill-set. The book presents the fundamentals of programming in Julia and in-depth informative examples, using a step-by-step approach. You will be taken through concepts and examples such as doing simple mathematical operations, creating loops, metaprogramming, functions, collections, multiple dispatch, and so on. By the end of the book, you will be able to apply your skills in Julia to create and explore applications of any domain.
Table of Contents (17 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
8
Data Visualization and Graphics

Modules and interfaces


Like many other languages, Julia also has a way to group similar logical sets of code together into workspaces, or also called as namespaces. They help us in creating top-level definitions - that is, global variables, without taking on the risk of code conflicts, as the names and variables used inside a module remain unique.

In Julia, we create a module as follows:

module SampleModule
..
..
end

Modules help us to indicate code that can be imported into other parts of the program, as well as the set of code meant to be used (or visible) to the world outside.

Here is one small example of a functional module:

# marks the start of the module named Utilities
julia> module Utilities
     # marks the type, variable or functions to be made 
       available
       export Stype, volume_of_cube
       type Stype
       name::Int64
       end
       function area_of_square(number)
       return number ^ 2
       end
       function volume_of_cube(number)
       return area_of_square...