proc | Daniel P. Clark

August 3, 2017 by Daniel P. Clark

Elixir Envy ᐅ Ruby

When a Rubyist learns about Elixir’s pipe operator and how it behaves similarly to Linux/Unix command line piping he, or she, very likely envies that feature and wishes to have it in Ruby. How can I say that or how could I know that? Well it’s a reasonable deduction when I see others, as well…

November 13, 2015 by Daniel P. Clark

Implement a Lazy Hash in Ruby

I use the term Lazy Hash in the same way you would call an Enumerator a lazy iterator. That being; the values don’t get evaluated until they are needed. In a Hash this is also utilizing memoization, where the value gets assigned the first time it’s used. E.G. @variable ||= :value Let’s say you own…

March 3, 2015 by Daniel P. Clark

Ruby: The Case for Case

It’s nice to have case and when available in Ruby. But I don’t see it used too often. I myself don’t use it much because I’m more accustomed to just using if and else. So let’s get into case switching. person = “employee” case person when “boss” puts “Yes sir!” when “employee” puts “Sure I’ll…

February 27, 2015 by Daniel P. Clark

Value Assignment and Deferment with Lambdas/Procs

When assigning a variable with a raw value the outcome is as you would expect. greeting = “hello” # => “hello” puts greeting # hello Now while learning about assigning methods to variables I used to wonder if I was assigning the result value from the method, or simply pointing to the method to be…

January 1, 2015 by Daniel P. Clark

When to use Ampersand and/or Colon with Proc, Map, and Inject

So with Ruby permitting Procs called on Objects I’ve found sometimes a Colon Method will work, and sometimes you need a Ampersand Colon Method. For example, when I map &:upcase on a list of strings it works. [“a”,”b”,”c”].map(&:upcase) # = > [“A”, “B”, “C”] But if I try without the Ampersand I get: [“a”,”b”,”c”].map(:upcase) #…