next

menu_book Course Curriculum (Crystal) expand_more

Basics

variables type inference constants symbols strings string interpolation tuples named tuples ranges nilable types

Control Flow

if unless case while until each times loop do break next begin rescue ensure

Methods

method definitions default arguments named arguments splat arguments double splat blocks yield block forwarding overloads macros vs methods

Types

classes structs modules enums abstract classes inheritance include extend properties class variables

Collections

Array Hash Set Deque Iterator Enumerable map select compact_map group_by sort_by

Generics and Macros

generic classes generic methods typeof is_a? narrowing case type narrowing macro macro for loops annotations compile-time run verbatim macro

Concurrency

spawn Fiber Channel buffered channel select sleep Mutex WaitGroup pattern HTTP server concurrency fiber exception handling

I/O and Ecosystem

File.read File.write IO.copy JSON serialization YAML parsing HTTP client HTTP server command execution spec tests shards dependencies

Crystal / Control Flow

Learn next in Crystal with a construct-specific explanation, unique example, engineering boundary, and mastery check.

10 min read • Beginner

next is a focused Crystal topic inside Control Flow. This lesson explains the construct itself, the state or value it operates on, and the observable result it produces.

Read the example as a small executable experiment. Identify the exact syntax that belongs to next, then change one input and predict the result before running it.

Topic-specific example

crystal-02-09-next.cr

crystal Try It Live

(1..5).each do |i|
  next if i.even?
  puts i
end

Edge case / engineering note

next has rules that are easy to miss when the example is copied mechanically. Check the feature-specific boundary shown by this construct: scope, mutability, evaluation order, type constraints, lifetime, error behavior, compile-time restrictions, or resource cleanup where applicable.

Content source & attribution

Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

next Mastery Check →

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break

begin rescue ensure

Topic-specific example

Lesson quizzes

Notice