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Ruby Academy · Lesson

case/when Expressions

Multi-way branching.

Multi-way Branching

When you compare one value against many possibilities, a long if/elsif chain gets noisy. Ruby's case expression makes multi-way branching clean and readable.

day = "Mon"
case day
when "Sat", "Sun"
  puts "Weekend"
else
  puts "Weekday"
end

Basic case / when

The value after case is compared to each when in order. The first match runs, then control jumps to end.

grade = "B"
case grade
when "A"
  puts "Excellent"
when "B"
  puts "Good"
when "C"
  puts "Okay"
end

All lessons in this course

  1. if, unless, ternary
  2. case/when Expressions
  3. Truthiness in Ruby
  4. Guard Clauses
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