按添加元素的顺序遍历字典

Question

I am having a dictionary which maps question-id to the question . While printing contents of dictionary, I want to access the elements in the order in which they were added. The question id is a random 10-digit string. This printing will be done numerous times. A dictionary elements can also be deleted in which case it will simply disappear while leaving the other elements in the exact same order.

It is probably not possible without creating a dictionary class of my own. Or is it?

var question_dic = {};
question_dic["2186242050"] = "Answer to life, universe and everything?";   //adding a key-value pair
delete question_dic[delete_key];   //remove delete_key key

Answer 1

It is probably not possible without creating a dictionary class of my own.

Yes, that's true. You cannot (and should not) use objects like that.

However, this is exactly the use case that Map s are introduced for in ES6. And even if you are not running your scripts in an ES6 environment, you don't need to create such a dictionary class of your own , as there exists a variety of polyfills.