如何使用JavaScript将字段添加到数组的每一行？

Question

I have a javascript variable:

var x = 
{"ab":"x",
 "cd":"y",
 "de":"z",
 "answers":[
    {"answerId":222,"answerUId":1,"text":"x"},
    {"answerId":223,"answerUId":2,"text":"A"},
    {"answerId":224,"answerUId":3,"text":"A"}
 ]
}

How can I add a field to each element of the answers array called response with a value of null ?

Answer 1

You can add the new property to the objects, like this

x["answers"].forEach(function(currentObject) {
    currentObject["response"] = null;
});

This iterates through each and every object and adds the response property to each of them.

Answer 2

Plain javascript:

for (key in x['answers']) {
    x['answers'][key]['response'] = null;
}