Lambda

Lambda

A lambda (created with lambda { ... } or the -> "stabby lambda" syntax) is similar to a Proc but behaves more like a regular method: it enforces the exact number of arguments, and return inside it only exits the lambda itself, not the enclosing method. Lambdas are generally preferred over Procs when you want method-like strictness and behavior. Both Proc and Lambda are instances of the same Proc class under the hood.

Note: The ->(x) { x * x } stabby lambda syntax is the more modern, concise way to write a lambda compared to lambda { |x| x * x }.

Example: Lambda

square = lambda { |x| x * x }
cube = ->(x) { x * x * x }

puts square.call(4)
puts cube.call(3)