How to get a max value from an array of Objects

Question

data = [
    {
        "group": "banana",
        "Nitrogen": "12",
        "normal": "15",
        "stress": "1"
    },
    {
        "group": "poacee",
        "Nitrogen": "6",
        "normal": "6",
        "stress": "20"
    },
    {
        "group": "sorgho",
        "Nitrogen": "11",
        "normal": "28",
        "stress": "12"
    },
    {
        "group": "triticum",
        "Nitrogen": "19",
        "normal": "20",
        "stress": "12"
    }
];

I have this array to use in a grouped bar chart. I want to get the maximum value out of all the values, which is 28 in this.

do you just need the highest value or the value with it's key? — AdityaParab, Jul 11 '22 at 11:24
Examples of this in here - https://stackoverflow.com/questions/4020796/finding-the-max-value-of-an-attribute-in-an-array-of-objects — 2189490, Jul 11 '22 at 11:25
Do you wish to get the object with the maximum `normal` value or do you wish to get only the max `normal` value? — ruth, Jul 11 '22 at 11:46

score 1 · Answer 1 · answered Jul 11 '22 at 11:35

As an alternative way to the other answers, you could sort your array from the highest to the lowest based on the normal property and select the first element:

data.sort((a, b) => parseInt(b.normal, 10) - parseInt(a.normal, 10));
console.log(data[0]); // The element with the highest normal value
console.log(data[0].normal) // Or just the highest normal value

Norbert Bartko · Answer 2 · 2022-07-11T11:31:45.700

0

I asume you want the max value from the normal property.

const data = [
    {
        "group": "banana",
        "Nitrogen": "12",
        "normal": "15",
        "stress": "1"
    },
    {
        "group": "poacee",
        "Nitrogen": "6",
        "normal": "6",
        "stress": "20"
    },
    {
        "group": "sorgho",
        "Nitrogen": "11",
        "normal": "28",
        "stress": "12"
    },
    {
        "group": "triticum",
        "Nitrogen": "19",
        "normal": "20",
        "stress": "12"
    }
  ];
  
  const max = data.map(x => +x.normal).reduce((a, b) => a > b ? a : b, 0);
  
  console.log(`Max: ${max}`);

edited Jul 11 '22 at 11:31

answered Jul 11 '22 at 11:26

Norbert Bartko

2,468
1
17
36

1

This definitely works for the `normal` property, but I'd rather ask for clarification from the OP first. (and in case it's only the `normal` property, the question is probably a dupe) – Jul 11 '22 at 11:35

score 0 · Answer 3 · answered Jul 11 '22 at 11:35

Just extract all the numeric values from all the objects in the array, concat them to a collective array, and then find out the max.

const data = [
  {
    "group": "banana",
    "Nitrogen": "12",
    "normal": "15",
    "stress": "1"
  },
  {
    "group": "poacee",
    "Nitrogen": "6",
    "normal": "6",
    "stress": "20"
  },
  {
    "group": "sorgho",
    "Nitrogen": "11",
    "normal": "28",
    "stress": "12"
  },
  {
    "group": "triticum",
    "Nitrogen": "19",
    "normal": "20",
    "stress": "12"
  }
];

const getMax = (arr) => {
  const op = arr.reduce((acc, cur) => {
    const vals = Object.values(cur).map(v => +v).filter(v => v);
    return acc.concat(vals);
  }, []);

  return Math.max.apply(null, op);
}

console.log(getMax(data)); // 28

nobalG · Answer 4 · 2022-07-11T11:34:30.403

-1

Well below code works

var data= [
    {
        "group": "banana",
        "Nitrogen": "12",
        "normal": "15",
        "stress": "1"
    },
    {
        "group": "poacee",
        "Nitrogen": "6",
        "normal": "6",
        "stress": "20"
    },
    {
        "group": "sorgho",
        "Nitrogen": "11",
        "normal": "28",
        "stress": "12"
    },
    {
        "group": "triticum",
        "Nitrogen": "19",
        "normal": "20",
        "stress": "12"
    }
  ];
let max = 0;
let finalObject;
for(let  i = 0 ; i < data.length; i++){
   var newMax = Math.max(parseInt(data[i].Nitrogen), parseInt(data[i].normal), parseInt(data[i].stress));
   if(newMax > max){
       max = newMax;
       finalObject = data[i];
   }
   
}
console.log(finalObject);

edited Jul 11 '22 at 11:34

answered Jul 11 '22 at 11:30

nobalG

4,544
3
34
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This wouldn't compile just right, because Math.max(...) expects an array of `number` while you're passing an array of `string`. – Jul 11 '22 at 11:33
sure, let me add parseInt @MikeS. – nobalG Jul 11 '22 at 11:33
There has to be something better than an O(n²) solution. – 2189490 Jul 11 '22 at 11:35
@2189490 agreed, will be glad if anyone can share the answer. Looking forward towards it :) – nobalG Jul 11 '22 at 11:37

How to get a max value from an array of Objects

4 Answers4