Method: Array#head

Defined in:
lib/ruby/jruby_hack.rb

#head ⇒ Object

Return the first item. Raises an IndexError if the Array is empty?.

Examples:

[1, 2, 3].head  #=> 1

Raises:

  • (IndexError) 


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# File 'lib/ruby/jruby_hack.rb', line 18

def head
  raise IndexError, "head of empty list" if empty?
  x, = self
  x
end