Functions
Ruby Lambdas
Using Lambdas
Ruby lambdas enforce strict argument counts with lambda.
Introduction to Ruby Lambdas
Ruby lambdas are a type of closure in Ruby, similar to Procs, but with stricter rules regarding argument handling. They are defined using the lambda keyword or the -> operator. Lambdas are useful when you want to encapsulate behavior or logic that can be passed around in your Ruby programs.
Defining a Lambda
There are two primary ways to define a lambda in Ruby. You can use the lambda keyword or the more concise -> syntax. Both approaches are functionally equivalent. Here’s how you can define them:
Strict Argument Count Enforcement
One of the key characteristics of lambdas in Ruby is that they enforce strict argument counts. This means that when you call a lambda, you must provide the exact number of arguments it expects. If you provide too few or too many arguments, Ruby will raise an error. This is in contrast to Procs, which do not enforce such strictness.
Returning from a Lambda
When a return statement is executed inside a lambda, it returns control to the calling method, rather than exiting the method where the lambda was defined. This is another key difference from Procs, which can unexpectedly exit the method they are called from.
Use Cases for Lambdas
Lambdas are particularly useful in scenarios where you need precise control over argument handling and when you want to ensure that the code block behaves like a method, especially in terms of returning values. They can be used for callbacks, deferred execution, and when implementing higher-order functions.
