Learning Functional Programming in Go

Ruby

Let's study lambda expressions in Ruby; it's quite insightful.

Ruby lets us define an anonymous lambda function in two ways. One uses the lambda keyword:

add = lambda {|a, b| a + b}

The other uses the stabby symbol:

add = -> a, b{a + b}

In the IRB console, we can call the lambda expression like this:

>> add.call(2, 1)=> 3

There's a lot we can do just with Ruby lambda. A Ruby lambda is a special kind of closure. Like Ruby blocks and procs, a Ruby lambda acts like a code snippet that can be passed around.

Where do we often see lambdas used with Ruby in real world applications? Ever worked with Rails? Ruby on Rails is a web application framework with an Object Relational Mapping (ORM) library named ActiveRecord. Ruby classes of type ActiveRecord::Base ...