仅在存在时修改Ruby哈希中的值

Question

我需要修改特定键的哈希值,但如果不存在则我不想添加键,长版本将是:

if my_hash.has_key?( :key )
    my_hash[ :key ] = true if my_hash[ :key ] == 0
    my_hash[ :key ] = false if my_hash[ :key ] == 1
    # leave value alone if it is not 0 or 1
else
    # leave hash alone if key is not present
end

我想知道是否会有更优雅的解决方案.

Answer 1

也许有case声明

case my_hash[:key]                                                                                                                                                                   
when 0; my_hash[:key] = true                                                                                                                                                         
when 1; my_hash[:key] = false                                                                                                                                                        
end