Question

Why doesn’t this line of code work?

['fdfsd','gfdhgf'].inject(Hash.new){|sum,e| sum[e] = e}

Using ruby-1.9.2-p180, got IndexError: string not matched

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Solved

['fdfsd','gfdhgf'].inject(Hash.new){|sum,e| sum[e] = e; sum}

Answer 1

In 1.9 there’s also each_with_object:

>> ['fdfsd','gfdhgf'].each_with_object(Hash.new){|e,sum| sum[e] = e}
=> {"fdfsd"=>"fdfsd", "gfdhgf"=>"gfdhgf"}

Note that compared to inject the block arguments are reversed and that you don’t have to explicitly return the accumulator. In this specific case I’d go with J-_-L’s answer by the way.