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course 1.2.2.1

Level: intermediate
1.2.2.1 | intermediate | 1 sessions
These three operators - map, sort and grep - pack a lot of functionality. Not uncommonly, the three can be used on a single line to extract, transform and order data. Use map to initialize, distill and transform data structures. Use sort to not only order data, but also shuffle data. Finally, grep is used to extract data using a test condition. Each of these operators lends itself to idiomatic patterns, which will be discussed. As well, each of these operators can be misused and can lead to subtle bugs in your code. I'll try to point a few of these out.

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course code

cat.course.level.sessions.session

e.g. 1.0.1.8

categories

0 | introduction and orientation

1 | perl fundamentals

2 | shell and prompt tools

3 | web development

4 | CPAN Modules

5 | Ruby

levels

level: all all ( 0 )

level: beginner beginner ( 1 )

level: intermediate intermediate ( 2 )

level: advanced advanced ( 3 )

[ consider using for instead of foreach ]
1.2.2.1 Effective use of map, sort and grep in Perl

syllabus

This course will teach some of the more advanced aspects of map, sort and grep operators. After this session, you will be able to recognize and interpret idiomatic expressions that use these operators, and construct your own extraction/transformation/search patterns.

other in this category

1.0.1.8 | Introduction to Perl

1.1.2.8 | Intermediate Perl

other by same level

1.1.2.8 | Intermediate Perl

2.1.2.4 | Data Mining and Analysis at the Command Line

2.2.2.2 | Prompt Tools

4.0.2.1 | Spans and Sets

4.1.2.2 | Random Numbers and Distributions

other by same instructor

Other courses by Martin Krzywinski.

0.0.0.1 | Orientation Session

0.1.0.1 | Two Problems

1.0.1.8 | Introduction to Perl

1.1.2.8 | Intermediate Perl

2.1.2.4 | Data Mining and Analysis at the Command Line

2.2.2.2 | Prompt Tools

4.0.2.1 | Spans and Sets

4.1.2.2 | Random Numbers and Distributions