convert array to a hash : Array Extension « Array « Ruby

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Ruby » Array » Array Extension   convert array to a hash class Array   def invert     h={}     self.each_with_index{|x,i| h[x]=i}     h   end end a = ["red","yellow","orange"] h = a.invert     # {"orange"=>2, "yellow"=>1, "red"=>0}   Related examples in the same category 1.  Add your method to system data type 2.  Add a new method to Array class 3.  Add shuffle method to Array class 4.  strip values from array 5.  Extract array in place 6.  Array cartesian 7.  Add method to Array class to convert an array to a hash 8.  each from both sides 9.  Extends array comparsion method 10.  Override array method 11.  Add new operator for Array 12.  Add subset and superset operator for Array 13.  Set permutation for Array 14.  Resequence the array 15.  Use hash to count elements in an array

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