How to write a switch statement in Ruby

klueless-io answered on July 29, 2021 Popularity 10/10 Helpfulness 4/10

answer How to write a switch statement in Ruby

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How to write a switch statement in Ruby

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# Five techniques (param, no param, regex, when/then, *array)

# With paramater
value=88
case value
when 1
  puts "Single value"
when 2, 3, 4
  puts "One of comma-separated values"
when 5..7
  puts "One of 5, 6, 7"
when 7...10
  puts "One of 8, 9, but not 10"
when "foo", "bar"
  puts "It's either foo or bar"
when String
  puts "You passed a string"
when ->(x) { x % 2 == 0 }
  puts "Even number (found this using lambda)"
else
  puts "Something else"
end

# Without paramater
value=4
case
when value < 3
  puts "Less than 3"
when value == 3
  puts "Equal to 3"
when (1..10) === value
  puts "Something in closed range of [1..10]"
end

# Using regular expressions
input = "hello 123"
case
when input.match(/\d/)
  puts 'String has numbers'
when input.match(/[a-zA-Z]/)
  puts 'String has letters'
else
  puts 'String has no numbers or letters'
end

# When/Then single line calls
score = 70
case score
when 0..40 then puts "Fail"
when 41..60 then puts "Pass"
when 61..70 then puts "Pass with Merit"
when 71..100 then puts "Pass with Distinction"
else "Invalid Score"
end

# Find element in array
element = 3
array = [1, 2, 3, 4, 5]
case element
when *array 
  puts 'found in array'
else
  puts 'not found in array'
end

Popularity 10/10 Helpfulness 4/10 Language ruby

Source: stackoverflow.com

Tags: case-statement case-when multiple-conditions ruby switch-statement

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Contributed on Nov 14 2022

klueless-io

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case a_variable # a_variable is the variable we want to compare
when 1    #compare to 1
  puts "it was 1" 
when 2    #compare to 2
  puts "it was 2"
else
  puts "it was something else"
end

Popularity 10/10 Helpfulness 6/10 Language shell

Source: Grepper

Tags: case

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Contributed on Jul 29 2021

Nimorum

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ruby switch case

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# Sample input
color = "green"

# Using case-when
case color
when "red"
  puts "The color is red"
when "blue"
  puts "The color is blue"
when "green"
  puts "The color is green"
else
  puts "The color is unknown"
end

Popularity 7/10 Helpfulness 1/10 Language ruby

Source: Grepper

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Contributed on Sep 11 2023

YOU.com

0 Answers Avg Quality 2/10

How to write a switch statement in Ruby

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