|eleventh draft, June 2006|
|About this Book|
|Table of Contents|
|J software and documentation are available at||J Software Home Page|
|This book is also available as a||single downloadable zip file|
|Please send comments and criticisms to the||J Forum|
This book is meant to help the reader to learn the computer-programming language J.
The book is intended to be read with enjoyment by both the beginning programmer and the experienced programmer alike. The only prerequisite is an interest on the part of the reader in learning a programming language.
The emphasis is on making the J language accessible to a wide readership. Care is taken to introduce only one new idea at a time, to provide examples at every step, and to make examples so simple that the point can be grasped immediately. Even so, the experienced programmer will find much to appreciate in the radical simplicity and power of the J notation.
The scope of this book is the core J language common to the many implementations of J available on different computers. The coverage of the core language is meant to be relatively complete, covering (eventually) most of the J Dictionary.
Hence the book does not cover topics such as graphics, plotting, GUI, and database access covered in the J User Guide. It should also be stated what the aims of the book are not: neither to teach principles of programming as such, nor to study algorithms, or topics in mathematics or other subjects using J as a vehicle, nor to provide definitive reference material.
The book is organized as follows. Part 1 is an elementary introduction which touches on a variety of themes. The aim is to provide the reader, by the end of Part 1, with an overview and a general appreciation of the J language. The themes introduced in Part 1 are then developed in more depth and detail in the remainder of the book.
Part 1: Getting Acquainted
| 1: Basics |
2: Lists and Tables
3: Defining Functions
4: Scripts and Explicit Functions
Part 2: Arrays
| 5: Building Arrays |
Part 3: Defining Functions: Verbs
| 8: Composing Verbs|
9: Trains of Verbs
10: Conditional and Other Forms
11: Tacit Verbs Concluded
12: Explicit Verbs
Part 4: Defining Functions: Operators
| 13: Explicit Operators|
15: Tacit Operators
Part 5: Structural Functions
| 16: Rearrangements |
17: Patterns of Application
18: Sets, Classes and Relations
Part 6: Numerical and
| 19: Numbers|
20: Scalar Numerical Functions
21: Factors and Polynomials
22: Vectors and Matrices
Part 7: Names and Objects
| 24: Names and Locales|
25: Object-Oriented Programming
Part 8: Facilities
| 26: Script Files|
27: Representations and Conversions
28: Data Files
29: Error Handling
| A1: Evaluating Expressions|
A2: Collected Terminology
The main changes in this eleventh draft are to bring the material into line with J601. All the examples have been executed with a beta version of J601.
Copyright © Roger Stokes 2006. This material may be freely reproduced, provided that this copyright notice, including this provision, is also reproduced.