How can I calculate the length of an array of objects with reduce?-CodePudding

I have this simple function, and I am just trying to get the length of this array of objects. For instance I want to return 3 in that case below. I could use .length() but I want to explore more with the reduce method.

function getSum(data) {
  const totalNum = data.reduce((sum, a) => sum   a.id, 0);
  return totalNum
}

console.log(getSum([
  {id: 'ddd6929eac', isComplete: true},
  {id: 'a1dd9fbd0', isComplete: true},
  {id: 'afa8ee064', isComplete: false}
]))

Thank you very much :)

CodePudding user response：

Well the equivalent of data.length would be:

data.reduce(sum => sum   1, 0);

But I don't see why you would do that unless you're trying to exclude blank values.

CodePudding user response：

You could add one for each item in the array.

function getSum(data) {
    return data.reduce((sum, a) => sum   1, 0);
}

const
    data = [{ id: 'ddd6929eac', isComplete: true }, { id: 'a1dd9fbd0', isComplete: true }, { id: 'afa8ee064', isComplete: false }];

console.log(getSum(data));

CodePudding user response：

Simply you can just add index:

const totalNum = data.reduce((sum, a, index) => index 1);