Today I Learned

hashrocket A Hashrocket project

Array#first returns different classes based on arg

Ruby's Array#first will have very different return types based on what arguments you provide. Without an argument, it will return nil or object. With an argument, it will always return a new array; even if your argument is 1 or 0.

a = [:foo, 'bar', 2]
# => :foo

# => [:foo]

# => []

With an empty array:

# => nil

# => []

# => []
See More #ruby TILs
Looking for help? Each developer at Hashrocket has years of experience working with Ruby applications of all types and sizes. We're an active presence at Ruby conferences, have written some of the most popular gems, and have worked on many of the web's Ruby on Rails success stories. Contact us today to talk about your Ruby project.