aarti · January 10, 2014 17:55
diff --git a/reverse_key_value_of_hash.rb b/reverse_key_value_of_hash.rb
 irb(main):001:0> h = { a: 1, b: 2 }
 => {:a=>1, :b=>2}
 # each_with_object same as reduce or inject, memo is a new hash.
 # unpack arguments in block
 irb(main):002:0> h.each_with_object({}) {|(k,v),new_hash| new_hash[v] =k }
 => {1=>:a, 2=>:b}
	irb(main):001:0> h = { a: 1, b: 2 }
	=> {:a=>1, :b=>2}
	# each_with_object same as reduce or inject, memo is a new hash.
	# unpack arguments in block
	irb(main):002:0> h.each_with_object({}) {\|(k,v),new_hash\| new_hash[v] =k }
	=> {1=>:a, 2=>:b}
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