如何将字符串中的数字转换为哈希

Question

给定字符串，例如"ABCD 100" ，将其转换为{"ABCD": 100}的最有效方法是什么，其中"ABCD"是键，而100是整数和值？

Answer 1

If that is the exact format I'd do

key, value = "ABCD 100".split
{key.to_sym => value.to_i}

If you're looking for a one-liner

Since ruby 2.4.0

["ABCD 100".split].to_h.each_with_object({}) { |(k, v), memo| memo[k.to_sym] = v.to_i }

From ruby 2.4.0

["ABCD 100".split].to_h.transform_values!(&:to_i)

Answer 2

Assuming that you have more than one key-value pair, you can combine split , each_slice and map :

"ABCD 100 EFG 200".split
                  .each_slice(2)
                  .map {|k, v| [k.to_sym, v.to_i]}.to_h
#=> {:ABCD=>100, :EFG=>200}

Or with scan and groups:

"ABCD 100 EFG 200".scan(/([A-Z]+)\s([0-9]+)/)
                  .map! {|k, v| [k.to_sym, v.to_i]}.to_h
#=> {:ABCD=>100, :EFG=>200}

Use regex according to your actual issue, it is just an instance.

Answer 3

If your pattern is string like "key value", you can use String#split. It takes a string and returns an Array of substrings delimited by a separator. If you don't give a separator, the default one is spaces.

def insert_values_from_string_into_hash(to_be_parsed_string, hash)
  string_key, value = to_be_parsed_string.split
  hash[string_key] = value
  hash
end   

insert_values_from_string_into_hash("ABCD 100", {})