How to get a max value from a array of Objects-CodePudding

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.

CodePudding user response：

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

CodePudding user response：

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}`);

CodePudding user response：

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

CodePudding user response：

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);