The Spaghetti Refactory Established 2015

Classy Ruby enumerating

Given two users:

User.create(first_name: "Joe", last_name: "Louis")
#=> User id: 1, first_name: "Joe", last_name: "Louis"

User.create(first_name: "Muhammed", last_name: "Ali")
#=> User id: 2, first_name: "Muhammed", last_name: "Ali"

Say you want to get an array of arrays, with each individual array containing two elements: the first and last name, and the id. You could do something like this, which is perfectly valid but also gross to read:

User.pluck(:id, :first_name, :last_name).map do |user|
id = user[0]
first = user[1]
last = user[2]
["#{first} #{last}", id]

However, it’s much more readable to use tuple syntax:

User.pluck(:id, :first_name, :last_name).map do |(id, first, last)|
["#{first} #{last}", id]
#=> [
["Joe Louis", 1],
["Muhammed Ali", 2]