Lambda

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 myLambda.call # Output: Hello, World!

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

myLambda = -> (v) { v * 2 }

puts myLambda.call(2) # Output: 4