Julia as a Second Language

402 Pages·2023·23.844 MB·

by  Erik Engheim

General purpose programming
with a taste of data science
Erik Engheim
M A N N I N G
Number
Real Complex
Abstract Abstract Rational
Integer
irrational float
Irrational
Float64 Float32
Bool Signed Unsigned
Int32 Int64 UInt64 UInt8
Type hierarchy for numbers in Julia, showing abstract and concrete number types
in dark gray and light gray, respectively
AbstractArray
AbstractRange DenseArray
OrdinalRange Array
Abstract StepRange
UnitRange
UnitRange
Type hierarchy for arrays and ranges in Julia. The dark gray types are
abstract while the light gray are concrete types.
Julia as a Second Language

Julia as a Second
Language
GENERAL PURPOSE PROGRAMMING
WITH A TASTE OF DATA SCIENCE
ERIK ENGHEIM
MANNING
SHELTER ISLAND
For online information and ordering of this and other Manning books, please visit
www.manning.com. The publisher offers discounts on this book when ordered in quantity.
For more information, please contact
Special Sales Department
Manning Publications Co.
20 Baldwin Road
PO Box 761
Shelter Island, NY 11964
Email: [e-mail]
©2023 by Manning Publications Co. All rights reserved.
No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in
any form or by means electronic, mechanical, photocopying, or otherwise, without prior written
permission of the publisher.
Many of the designations used by manufacturers and sellers to distinguish their products are
claimed as trademarks. Where those designations appear in the book, and Manning Publications
was aware of a trademark claim, the designations have been printed in initial caps or all caps.
Recognizing the importance of preserving what has been written, it is Manning’s policy to have
the books we publish printed on acid-free paper, and we exert our best efforts to that end.
Recognizing also our responsibility to conserve the resources of our planet, Manning books
are printed on paper that is at least 15 percent recycled and processed without the use of
elemental chlorine.
The author and publisher have made every effort to ensure that the information in this book
was correct at press time. The author and publisher do not assume and hereby disclaim any
liability to any party for any loss, damage, or disruption caused by errors or omissions, whether
such errors or omissions result from negligence, accident, or any other cause, or from any usage
of the information herein.
Manning Publications Co. Development editor: Marina Michaels
20 Baldwin Road Technical development editor: Milan C´urcˇic´
PO Box 761 Review editor: Adriana Sabo
Shelter Island, NY 11964 Production editor: Kathleen Rossland
Copy editor: Christian Berk
Proofreader: Jason Everett
Technical proofreader: Maurizio Tomasi
Typesetter: Dennis Dalinnik
Cover designer: Marija Tudor
ISBN: 9781617299711
Printed in the United States of America
To my grandparents,
who paid for my first computer: an Amiga 1000.

brief contents
PART 1 BASICS..........................................................................1
1 ■ Why Julia? 3
2 ■ Julia as a calculator 16
3 ■ Control flow 34
4 ■ Julia as a spreadsheet 59
5 ■ Working with text 86
6 ■ Storing data in dictionaries 104
PART 2 TYPES.......................................................................119
7 ■ Understanding types 121
8 ■ Building a rocket 141
9 ■ Conversion and promotion 160
10 ■ Representing unknown values 176
PART 3 COLLECTIONS...........................................................187
11 ■ Working with strings 189
12 ■ Understanding Julia collections 217
vii
viii BRIEF CONTENTS
13 ■ Working with sets 242
14 ■ Working with vectors and matrices 260
PART 4 SOFTWARE ENGINEERING...........................................275
15 ■ Functional programming in Julia 277
16 ■ Organizing and modularizing your code 299
PART 5 GOING IN DEPTH.......................................................321
17 ■ Input and output 323
18 ■ Defining parametric types 335