哈希

Question

內使用Ruby哈希值有沒有辦法做這樣的事情：

numbers = { 
    "one" => "two", 
    "three" => numbers["one"] } 

我知道我可以只讓哈希和設置一切正常像numbers["one"]但醜......

Answer 1

不，因爲numbers尚未確定，但可以使指定的項目超過一次的變量：

# seems odd, but ok... 
def_num = "two" 
numbers = { 'one' => def_num, 'two' => def_num }