Return object with highest value from multiple arrays of objects

Question

I have an array with multiple arrays of objects and Im trying to find the object with the highest value.

values = [
[ {_: "NAN", id: 1},
  {_: "NAN", id: 2},
  {_: "NAN", id: 3}
],
[{_: "3.006", id: 4},
 {_: "7.206", id: 5},
 {_: "1.906", id: 6}
],
[{_: "3.226", id: 7},
 {_: "2.222", id: 8}
 {_: "2.224", id: 9}
],
[{_: "0.006", id: 10},
 {_: "0.321", id: 11},
 {_: "0.938", id: 12}
]]

i tried to use .map and .find

        var a = Math.max(...values.map(e => e._))
        const highestPoint = values.find(values => values._ === a)

But its only bringing back NAN as highest point const highestPoint = {_: "NAN", id: 1}, like its only looking through the first array?

Nina Scholz · Accepted Answer · 2020-04-23 15:17:35Z

3

You could flat the arrays and take a filter with isFinite and reduce the array.

var values = [[{ _: "NAN", id: 1 }, { _: "NAN", id: 2 }, { _: "NAN", id: 3 }], [{ _: "3.006", id: 4 }, { _: "7.206", id: 5 }, { _: "1.906", id: 6 } ], [{ _: "3.226", id: 7 }, { _: "2.222", id: 8 }, { _: "2.224", id: 9 }], [{ _: "0.006", id: 10 }, { _: "0.321", id: 11 }, { _: "0.938", id: 12 }]],
    highest = values
        .flat()
        .filter(({ _ }) => isFinite(_))
        .reduce((a, b) => +a._ > +b._ ? a : b);

console.log(highest);

edited Apr 23, 2020 at 15:17

answered Apr 23, 2020 at 15:10

Nina Scholz

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2 Comments

symlink Over a year ago

Of course, Array.flat() is all that is needed. I was using Array.flatMap()!

Radu Diță Over a year ago

I would argue that using isFinite would exclude correct maximum when you have +Infinity in the array.

symlink · Accepted Answer · 2020-04-23 15:13:08Z

0

You can do this with Array.flatMap() and Array.map() to put all the objects into one array, Array.filter() to remove the objects with "NAN", then Array.reduce to find the highest number:

let vals=[[{_:"NAN",id:1},{_:"NAN",id:2},{_:"NAN",id:3}],[{_:"3.006",id:4},{_:"7.206",id:5},{_:"1.906",id:6}],[{_:"3.226",id:7},{_:"2.222",id:8},{_:"2.224",id:9}],[{_:"0.006",id:10},{_:"0.321",id:11},{_:"0.938",id:12}]];

let res = vals.flatMap(arr => {
    return arr.map(obj => obj)
}).filter(obj => obj._ != "NAN").reduce((prv,cur) => prv._ > cur._ ? prv : cur)

console.log(res)

answered Apr 23, 2020 at 15:13

symlink

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Comments

Radu Diță · Accepted Answer · 2020-04-23 15:16:12Z

0

When any of the arguments to Math.max is not a number the result will be NaN.

You have an array of arrays, so when mapping you get arrays as the argument to Math.max so you need to filter the data and then pass it to max.

Something like this should work

values.flat().filter(item => !isNaN(Number(item._)))

Then you can pass this to max and will work.

answered Apr 23, 2020 at 15:16

Radu Diță

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Comments

xdeepakv · Accepted Answer · 2020-04-23 16:36:16Z

Simple and fast enough:

const max = (arr = []) => {
  return arr.reduce(
    (m, i) => {
      i.forEach((x) => {
        if (x._ !== 'NAN' && m._ < x._) {
          m = x;
        }
      });
      return m;
    },
    { _: -Infinity }
  );
};

const max = (arr = []) => {
  return arr.reduce(
    (m, i) => {
      i.forEach((x) => {
        if (x._ !== 'NAN' && m._ < x._) {
          m = x;
        }
      });
      return m;
    },
    { _: -Infinity }
  );
};
const data = [
  [
    { _: "NAN", id: 1 },
    { _: "NAN", id: 2 },
    { _: "NAN", id: 3 },
  ],
  [
    { _: "3.006", id: 4 },
    { _: "7.206", id: 5 },
    { _: "1.906", id: 6 },
  ],
  [
    { _: "3.226", id: 7 },
    { _: "2.222", id: 8 },
    { _: "2.224", id: 9 },
  ],
  [
    { _: "0.006", id: 10 },
    { _: "0.321", id: 11 },
    { _: "0.938", id: 12 },
  ],
];
console.log(max(data));

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