Module: ArrayKeys::KeySet

Defined in:
lib/sequel/array_keys.rb

Overview

The KeySet module contains methods that extend an array of keys to return a key’s position in the key set.

Instance Method Summary collapse

Instance Method Details

#add_key(key) ⇒ Object

Adds a key to the key set.



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# File 'lib/sequel/array_keys.rb', line 21

def add_key(key)
  self << key
  @key_indexes[key] = @key_indexes.size
end

#del_key(idx) ⇒ Object

Removes a key from the key set by its index.



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# File 'lib/sequel/array_keys.rb', line 27

def del_key(idx)
  delete_at(idx)
  @key_indexes = nil # reset key indexes
end

#key_pos(key) ⇒ Object

Returns the key’s position in the key set. Provides indifferent access for symbols and strings.



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# File 'lib/sequel/array_keys.rb', line 15

def key_pos(key)
  @key_indexes ||= inject({}) {|h, k| h[k.to_sym] = h.size; h}
  @key_indexes[key] || @key_indexes[key.to_sym] || @key_indexes[key.to_s]
end