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This is code to only output the specified columns of the object. However, I am getting the output 4 times undefined.

const array1 = [{
  name: 'k',
  age: 5,
  sex: 'f'
}, {
  name: 'a',
  age: 2,
  sex: 'm'
}];

const result = function(col, arr) {
  for (let obj of col.values()) {
    for (let i = 0; i < arr.length; i++) {
      console.log(arr[i].obj);
    }
  }
}

result(['name', 'age'], array1);

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4
  • 1
    If you want to log the entire objects then just log arr[i]. These objects have no property named obj. They have name, age, and sex. Commented Mar 7, 2022 at 21:09
  • 1
    .obj is not a property on the array item? Commented Mar 7, 2022 at 21:10
  • There is no obj property Commented Mar 7, 2022 at 21:10
  • 1
    Ohh I got it. I should use arr[i][obj] instead of arr[i].obj Thank you. Commented Mar 7, 2022 at 21:12

1 Answer 1

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1

You need to take the items of cols and change the accessor of arr.

const
    array1 = [{ name: 'k', age: 5, sex: 'f' }, { name: 'a', age: 2, sex: 'm' }],
    result = function(col, arr) {
        for (const key of col) {
            for (let i = 0; i < arr.length; i++) {
                console.log(arr[i][key]);
            }
        }
    };

result(['name', 'age'], array1);

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