Perl New Features
Perl New Features
The evolution of Perl from v5.10 to now.
About the Book
I've collected to "new features" posts from The Effective Perler, updated them, and put them into a single book. Read about the new features, deprecations, and other changes to Perl since v5.8 to v5.32.
About the Author
Bundles that include this book
Table of Contents
- Preface
- Introduction
- Perl v5.10
- Turn on new features implicitly
- Enable features on the command line
- Newlines for free
- Lexically-persistent variables
- Defined-or
- Method resolution orders
- Stacked file test operators
- Architecture-dependent pack formats
- Get the number of bytes or characters unpacked
- Run code at the end of compilation
- Branch reset numbering
- Generic line ending
- Grammars in regex
- Named captures
- Relative back references
- Ignore part of a substitution's match
- Version strings
- Perl v5.12
- Specify the package version inline
- The each operator works on arrays
- The length of undef is undef
- Local hash key deletion
- Get strict for free
- The yada yada operator
- Not-a-newline character class
- Perl v5.14
- Specify any character by its octal ordinal value
- non-destructive substitutions
- Non-destructive transliteration
- Enforce ASCII semantics when you want only ASCII
- Package blocks
- Get the pseudorandom seed
- Pure ASCII semantics in regexes
- Default regular expression modifiers
- Regex stringification changes
- Perl v5.16
- Proper case folding
- Refer to the current subroutine
- Unicode property inversion map
- Unicode loose name matching
- Perl v5.18
- Computed loop labels
- The experimental pragma
- Experimental features warn
- Character class set operations
- The vertical tab is part of \s
- %ENV values are immediately stringified
- Perl v5.20
- -F implies -a and -n
- Key/value slices
- Fixes to taint problems with locale
- The prototype attribute
- Subroutine signatures
- Perl v5.22
- Reference aliasing
- Safe command-line handling with the double diamond
- Hexadecimal floating point literals
- Turn all capture groups into cluster groups
- Fancy unicode word boundaries
- Perl v5.24
- Automatic dereferencing is gone
- Lexical topic is gone
- Postfix dereferencing
- Line break word boundary
- Perl v5.26
- Deprecation warnings include version
- @INC Drops the Current Directory
- keys in scalar context now returns the count
- Indented heredocs
- Mix assignment and reference aliasing
- Named lexical subroutines
- Don't use POSIX to create temporary files
- Recognize version control conflict markers
- An array for all capture buffers
- Escape the left brace in a regex
- Comments in character classes
- Perl v5.28
- Initialize aggregates in state
- Safer in-place editing
- Zero-width heredoc delimiters forbidden
- Strictly numeric bitwise operators
- Delete key-value slices
- Flip the order of prototypes and signatures
- Perl v5.30
- Postfix false conditions forbidden in declarations
- Fixed single-quoted pre-compiled patterns that use named characters
- Variable-width lookbehinds
- Perl v5.32
- The class instance operator, isa
- Chained comparison operators
- Alpha assertions for extended patterns
- Match only the same Unicode script
- No indirect objects
- Perl v5.34
- Updated octal literal syntax
- "Up to N" matches
- Insignificant whitespace in brace constructs
- Experimental try-catch
- Perl v5.36
- Automatically turn on warnings
- given-when is no longer enabled by specifying a version bundle
- Goodbye indirect
- Goodbye multidimensional data structures
- @_ is experimental in signatured subs
- Slurp a file from the command line
- New builtin functions
- Iterate over multiple elements at the same time
- Iterate the key and value at the same time
- Know if something is a boolean
- Deferring actions
- The try-catch gets a finally
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