CODEWITHSUNDEEP
javascriptobjectmax
Optimus
Optimus

Reputation: 116

Get Maximum key.value pair from object without for loop

var obj={'one':1,'two':50,'three':75,'four':12}

This is object from which i want the output as 'three':75, this is key value pair for maximum value in object. My constraint is not to use for loop and any library. Is it possible??

Upvotes: 3

Views: 768

Answers (4)

Isabek Tashiev
Isabek Tashiev

Reputation: 1044

By the way I found another solution but it also uses loop.

var obj = {'one': 1, 'two': 50, 'three': 75, 'four': 12};

var maxKey = Object.keys(obj).sort(function (a, b) {
  return obj[a] < obj[b];
})[0];

var result = {};
result[maxKey] = obj[maxKey];

Upvotes: 4

ozil
ozil

Reputation: 7117

you can make a new object form given object of this structure 

var newObject = [
    { key: 'one', value: 1 },  // key value structure
    { key: 'two', value: 50 },
    { key: 'three', value: 75 },
    { key: 'four', value: 12 }
 ];


var obj = {
    'one': 1,
    'two': 50,
    'three': 75,
    'four': 12
}

var newObJ = Object.keys(obj).map(function (key) {
    return {
        "key": key,
            "value": obj[key]
    }
});
var max = Math.max.apply(null, newObJ.map(function (el) {
    return el.value;
}));

var output = newObJ.filter(function (el) {
    return el.value === max;
})[0];

document.write(output.key + ': ' + max);

Upvotes: 0

Andy
Andy

Reputation: 63524

You could perhaps achieve this if you were willing to change your data structure around a bit. Instead of an object have an array of objects, and then use filter to grab the object based on the maximum value:

var arr = [
    { key: 'one', value: 1 },
    { key: 'two', value: 50 },
    { key: 'three', value: 75 },
    { key: 'four', value: 12 }
];

var max = Math.max.apply(null, arr.map(function (el) {
  return el.value;
}));

var output = arr.filter(function (el) {
  return el.value === max;
})[0];

console.log(out.key + ': ' + out.value); // three: 75

DEMO

Upvotes: 1

Isabek Tashiev
Isabek Tashiev

Reputation: 1044

My solution with loop. 

var obj = {'one':1,'two':50,'three':75,'four':12} ; 

var maxKey = Object.keys(obj).reduce(function (prev, next){ 
                 return obj[prev] > obj[next] ? prev : next; 
             });

var result = {};
result[maxKey] = obj[maxKey];

console.log(result);

Upvotes: 2

Related Questions