Class: CircularList::List

Inherits:

Object

• Object
• CircularList::List

Defined in:

lib/circular_list.rb

Instance Method Summary

• #fetch_after(e) ⇒ Object
• #fetch_before(e) ⇒ Object
• #fetch_next(index = 0) ⇒ Object
• #fetch_previous(index = 0) ⇒ Object
• #initialize(array) ⇒ List constructor

  A new instance of List.

• #size ⇒ Object

Constructor Details

#initialize(array) ⇒ List

Returns a new instance of List.

# File 'lib/circular_list.rb', line 5

def initialize(array)
  @arr = array
end

Instance Method Details

#fetch_after(e) ⇒ Object

# File 'lib/circular_list.rb', line 21

def fetch_after(e)
  fetch_next(@arr.index(e))
end

#fetch_before(e) ⇒ Object

# File 'lib/circular_list.rb', line 25

def fetch_before(e)
  fetch_previous(@arr.index(e))
end

#fetch_next(index = 0) ⇒ Object

# File 'lib/circular_list.rb', line 17

def fetch_next(index=0)
  index.nil? ? nil : @arr.push(@arr.shift)[index]
end

#fetch_previous(index = 0) ⇒ Object

# File 'lib/circular_list.rb', line 13

def fetch_previous(index=0)
  index.nil? ? nil : @arr.unshift(@arr.pop)[index]
end

#size ⇒ Object

# File 'lib/circular_list.rb', line 9

def size
  @arr.size
end