What are some examples of Ruby Lambda functions?

What are some examples of Ruby Lambda functions?

Ruby Lambda functions are anonymous functions that can be used to encapsulate code. For example, you can create a simple lambda to add two numbers: add = ->(x, y) { x + y }. You can then call it with add.call(2, 3).

Can you give me more examples of how to use them?

Sure! You can use lambdas for filtering arrays. For instance, numbers = [1, 2, 3, 4]; even_numbers = numbers.select(&->(n) { n.even? }) will return [2, 4].

What about using them in a class?

In a class, you can define a lambda as an instance variable. For example: @greet = ->(name) { "Hello, #{name}!" }. You can then call it with @greet.call('Alice').

Are there any performance considerations with using lambdas?

Yes, while lambdas are convenient, they can introduce overhead if used excessively in performance-critical code. It's best to use them judiciously.