如何更新哈希的所有键？

Question

我有这样的哈希

a={"Feb-13"=>"24176", "Aug-13"=>0, "May-13"=>0, "Jun-13"=>0, "Apr-13"=>0, "Oct-13"=>0, "Nov-13"=>0, "Jul-13"=>0, "Sep-13"=>0, "Jan-13"=>0, "Mar-13"=>0, "Dec-13"=>0}

但我需要像这样的哈希

a={"Feb"=>"24176", "Aug"=>0, "May"=>0, "Jun"=>0, "Apr"=>0, "Oct"=>0, "Nov"=>0 }

是否有其他方法，例如哈希更新。

Answer 1

a={"Feb-13"=>"24176", "Aug-13"=>0, "May-13"=>0, "Jun-13"=>0, "Apr-13"=>0, "Oct-13"=>0, "Nov-13"=>0, "Jul-13"=>0, "Sep-13"=>0, "Jan-13"=>0, "Mar-13"=>0, "Dec-13"=>0}

Hash[a.map { |k, v| [k[0...3], v] }]
# => {"Feb"=>"24176", "Aug"=>0, "May"=>0, "Jun"=>0, "Apr"=>0, "Oct"=>0, "Nov"=>0, "Jul"=>0, "Sep"=>0, "Jan"=>0, "Mar"=>0, "Dec"=>0} 

Answer 2

这个怎么样？：

a.inject({}) { |initial, (k,v)| initial[k[0..2]] = v; initial }

#=> {"Feb"=>"24176",
 "Aug"=>0,
 "May"=>0,
 "Jun"=>0,
 "Apr"=>0,
 "Oct"=>0,
 "Nov"=>0,
 "Jul"=>0,
 "Sep"=>0,
 "Jan"=>0,
 "Mar"=>0,
 "Dec"=>0}

或者：

Hash[a.map{ |x, y| [x[0..2], y] }]
#=> {"Feb"=>"24176",
 "Aug"=>0,
 "May"=>0,
 "Jun"=>0,
 "Apr"=>0,
 "Oct"=>0,
 "Nov"=>0,
 "Jul"=>0,
 "Sep"=>0,
 "Jan"=>0,
 "Mar"=>0,
 "Dec"=>0}

Answer 3

> Hash[a.map{|k,v| [k[/\w+/], v]}]
# => {"Feb"=>"24176", "Aug"=>0, "May"=>0, "Jun"=>0, "Apr"=>0, "Oct"=>0, "Nov"=>0, "Jul"=>0, "Sep"=>0, "Jan"=>0, "Mar"=>0, "Dec"=>0}