Inject This

It’s well known now that while Ruby is solid, it’s a work-in-progress.
For instance, it’s not that DRY yet - take Class method declarations as an example:

class Foo
  class << self
    def bar
    ...

or

class Foo
  class << Foo
    def bar
    ...

or

class Foo
  def self.bar
  ...

or

class Foo
  def Foo.bar
  ...

or

class Foo
end

def Foo.bar
...

Sometimes though, like this occassion, I don’t think the choice is such a bad thing. It encourages you not to be brainless and use what makes sense to you.
Those who’ve worked with me know that I’m particularly sensitive to informative method names, so this one’s recently taken the cake:

Enumerable#inject

The name suggests you’re shoving something in the Collection right? Wrong! It iterates all elements with the intention of assembling a value, such as a sum.
Inject! Pffh!