Class: Whitespace::Stack

Inherits:
Object
  • Object
show all
Defined in:
lib/whitespace/data_structures/stack.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Stack

Returns a new instance of Stack.



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# File 'lib/whitespace/data_structures/stack.rb', line 3

def initialize
  @elements = []
end

Instance Method Details

#pop ⇒ Object

Raises:



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# File 'lib/whitespace/data_structures/stack.rb', line 11

def pop
  return @elements.pop unless @elements.empty?
  raise EmptyError
end

#push(x) ⇒ Object 



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# File 'lib/whitespace/data_structures/stack.rb', line 7

def push(x)
  @elements.push x
end

#size ⇒ Object 



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# File 'lib/whitespace/data_structures/stack.rb', line 21

def size
  @elements.size
end

#top ⇒ Object

Raises:



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# File 'lib/whitespace/data_structures/stack.rb', line 16

def top
  return @elements.last unless @elements.empty?
  raise EmptyError
end