Coding/Learn/perl/perl loop control next last redo
Perl Programming & Scripting Automation Complete Course
01.Introduction to Perl & Scripting Philosophy
02.Syntax Rules, Comments & Strict Pragmas
03.Scalars: Numbers, Strings & Sigils ($)
04.Operators: Math, Dot (.) Concatenation & Comparisons
05.Booleans, Truth Values & defined()
06.Standard I/O: print, say & chomp
07.Conditional Branching: if, elsif & else
08.The unless Statement
09.Statement Modifiers (Postfix Conditionals)
10.Ternary Operator & Short-Circuit Logic
11.Switch Dispatch & Table Branching
12.Variable Scope: my, state & our
13.While & Until Loops
14.C-Style Three-Part for Loops
15.Foreach Loops & The Default Variable ($_)
16.Loop Control: next, last & redo
17.Labeled Loops & Nested Control
18.Postfix Loops (Modifier Loops)
19.Array Fundamentals: Sigil (@) & Indexing
20.Quote Words (qw//) & List Assignments
21.Stack & Queue Ops: push, pop, shift & unshift
22.Array Slices & Range Operators
23.The splice() Swiss Army Knife
24.Functional List Processing: map, grep & sort
25.Hash Fundamentals: Sigil (%) & Fat Comma (=>)
26.Iterating Hashes: keys, values & each
27.Key Management: exists vs defined & delete
28.Hash Slices (@hash{keys})
29.Sorting Hashes by Values & Keys
30.Nested Data Structures & Arrow Syntax
31.Subroutines: Definition & Arguments (@_)
32.Return Values & Modern Subroutine Signatures
33.References & Dereferencing Operators
34.Anonymous Arrays ([]) & Anonymous Hashes ({})
35.Anonymous Subroutines & Closures
36.Context Sensitivity: Scalar, List & wantarray
37.Regular Expression Basics & Binding (=~)
38.Character Classes, Shortcuts & Quantifiers
39.Capturing Groups ($1, $2) & Named Captures
40.Search & Replace: Substitution Operator (s///)
41.Text Tokenization: split & join
42.Lookarounds, Word Boundaries & Anchors
43.File I/O: Three-Argument open() & Reading Streams
44.Writing & Appending: Modes (>) and (>>)
45.File Test Operators & Directory Operations
46.Executing System Commands: system(), qx// & $?
47.CLI Arguments (@ARGV) & Environment (%ENV)
48.Packages, Modules & the 1; Convention
49.Object-Oriented Perl: bless & Constructors
50.OOP Inheritance & Method Overriding
51.CPAN & JSON Serialization (JSON::PP)
52.Capstone: Apache/Nginx Web Server Access Log Parser
53.Comprehensive Perl Mastery Assessment Quiz
54.Production Capstone: Multi-Source ETL & Reporting Engine
55.Scripting & Automation Certified Specialist Exam
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LearnLoop Control: next, last & redo
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Lesson 16 of 55
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Loop Control: next, last & redo

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In Plain English

Perl uses `next` (skip to next iteration, like `continue`), `last` (terminate loop, like `break`), and `redo` (restart current iteration without re-evaluating the loop condition).

Deep Dive: How It Works

next: Skips remaining body statements and advances to the next iteration.

last: Immediately breaks out of the enclosing loop.

redo: Re-executes the current iteration block without advancing the iterator or testing condition.

PointCore Rules to Remember

Point star
next vs continue: `next` is Perl name for skipping to the next iteration.
Point star
last vs break: `last` exits the loop immediately.

Live Interactive Example

Hit Run Code to see it live
Filtering and Breaking with next and last
Python 3.12
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Output Console
Click "Run Code" to view the rendered output.
How it works: next skipped 2, 4, 6, 8, and last stopped after 7.

Your Turn: Micro Challenge

No pressure! Edit the starter code below and test your solution with instant feedback.

Micro Exercise

Skip Number 3 with next

  • PointIterate numbers `(1..5)` using `for my $i (1..5)`.
  • PointUse `next if ($i == 3);` to skip 3.
  • PointPrint `"$i "` for the rest, followed by `"\n"`.
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Sandbox Output
Click "Run & Check" to test your solution.

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