Module: Enumerable

Defined in:
lib/extensions/enumerable.rb

Overview

TODO: Get these added to the pretty_ruby gem, and use that. (Note that it uses refinements, not monkey-patching.)

Instance Method Summary collapse

Instance Method Details

#map_dig ⇒ Object 



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# File 'lib/extensions/enumerable.rb', line 38

def map_dig(*)
  map{ |a| a.dig(*) }
end

#nth(n) ⇒ Object

Prefer 1-based indexing to get the nth element.



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# File 'lib/extensions/enumerable.rb', line 34

def nth(n) # rubocop:disable Naming/MethodParameterName
  drop(n - 1).first
end

#only ⇒ Object

Like first or last, but requires that there be exactly one element.



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# File 'lib/extensions/enumerable.rb', line 23

def only
  fail IndexError, "expected to have exactly 1 element" unless size == 1
  first
end

#rest(count = 1) ⇒ Object

Allow Scheme-style rest.



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# File 'lib/extensions/enumerable.rb', line 6

def rest(count = 1)
  drop(count)
end

#same? ⇒ Boolean

Returns true iff all the elements are equal. Returns false if there are no elements.

Returns:



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# File 'lib/extensions/enumerable.rb', line 18

def same?
  uniq.size == 1
end

#second ⇒ Object

Allow Rails-style second.



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# File 'lib/extensions/enumerable.rb', line 29

def second
  drop(1).first
end

#tail ⇒ Object

Allow Scheme-style tail. FIXME: Shouldn't this be the same as rest?



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# File 'lib/extensions/enumerable.rb', line 12

def tail
  return self if empty?
  last(size - 1)
end