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
– AdityaParab, Commented Jul 11, 2022 at 11:24
Examples of this in here - stackoverflow.com/questions/4020796/… — 2189490
– 2189490, Commented Jul 11, 2022 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? — Barremian
– Barremian, Commented Jul 11, 2022 at 11:46

ebarooni · Accepted Answer · 2022-07-11 11:35:31Z

1

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

answered Jul 11, 2022 at 11:35

ebarooni

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Norbert Bartko · Accepted Answer · 2022-07-11 11:31:45Z

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, 2022 at 11:31

answered Jul 11, 2022 at 11:26

Norbert Bartko

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1 Comment

user13258211 Over a year ago

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)

AdityaParab · Accepted Answer · 2022-07-11 11:35:47Z

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 · Accepted Answer · 2022-07-11 11:34:30Z

-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, 2022 at 11:34

answered Jul 11, 2022 at 11:30

nobalG

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4 Comments

user13258211 Over a year ago

This wouldn't compile just right, because Math.max(...) expects an array of number while you're passing an array of string.

nobalG Over a year ago

sure, let me add parseInt @MikeS.

2189490 Over a year ago

There has to be something better than an O(n²) solution.

nobalG Over a year ago

@2189490 agreed, will be glad if anyone can share the answer. Looking forward towards it :)

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