JavaScript: Assigning values to array of null/empty objects

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;
}

@clabe45 I really didn't try anything since I had no idea how to even approach this. — user7217977
– user7217977, Commented Oct 9, 2018 at 23:12
Think about your problem. You want to assign an incrementing number to a corresponding letter in the array of objects. You're on the right track, but you're setting the key property of each object. One way is to convert the integer to a letter. — clabe45
– clabe45, Commented Oct 9, 2018 at 23:14

CertainPerformance · Accepted Answer · 2018-10-09 23:07:32Z

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);

answered Oct 9, 2018 at 23:07

CertainPerformance

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