ruby - 改变哈希

Question

我有一个哈希

original_hash = {"10"=>3, "15"=>2, "20"=>1}

我想创建一个新的哈希，调用它results_hash，其中的键original_hash将附加'$'符号，键的新值将是original_hash. 生成的results_hash应该是：

results_hash = {"$10"=>30, "$15"=>30, "$20"=>20}

我怎样才能做到这一点？

Answer 1

resulted_hash = {}

original_hash.each do |key, val|
 resulted_hash["$" + k] = v*k.to_i
end

Answer 2

original_hash = {"10"=>3, "15"=>2, "20"=>1}
results_hash = Hash[original_hash.map { |k,v| ['$'+k,k.to_i*v] }]
p results_hash # => {"$10"=>30, "$15"=>30, "$20"=>20}

original_hash = {"10"=>3, "15"=>2, "20"=>1}
results_hash = original_hash.each_with_object({}) { |(k,v),h| h['$'+k]=k.to_i*v }
p results_hash # => {"$10"=>30, "$15"=>30, "$20"=>20}