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| "abcda".chars.group_by(&:chr).map{|k,v| {k => v.size}} | |
| "abca".chars.inject(Hash.new(0)){|h, c| h[c] +=1; h} | |
| "abca".chars.inject(Hash.new(0)){|h, c| h[c] +=1} | |
| "abca".chars.inject(Hash.new(0)){|h, c| puts h; h[c] +=1; } |
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