Published Jul 30, 2021Updated Sep 9, 2021
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In Ruby, lambdas are anonymous function code blocks that can take zero or more arguments. They can then be stored or passed in other values and called primarily with the #call method.


If zero arguments are used, use either -> or lambda:

myLambda = lambda { puts "Hello, World!" }
puts # Output: Hello, World!

If 1 or more arguments are used, use ->:

myLambda = -> (v) { v * 2 }
puts # Output: 4

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