JavaScript：将值分配给空/空对象数组

Question

I know the syntax is wrong, but in the following code key is supposed to equal the object's key. As the loop iterates, key gets assigned the i value, so a:1 , b:2 ...etc.

var objArr = [
  {a: null},
  {b: null},
  {c: null}
];

for (var i = 0; i < objArr.length; i++) {
    objArr[i].key = i;
}

Answer 1

Assuming the objects only contain one key, you can find the key using Object.keys[0] :

 var objArr = [ {a: null}, {b: null}, {c: null} ]; objArr.forEach((obj, i) => { const key = Object.keys(obj)[0]; obj[key] = i; }); console.log(objArr);