Get Max Key in Key-Value Pair in JavaScript - Stack Overflow

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Please consider these Key-Value Pairs:

var dict_Numbers = {"96": "0",
                    "97": "1",
                    "98": "2",
                    "99": "1",
                    "100": "4",
                    "101": "0"}

I would like to get the highest value - in this example it would be 101.

How can I achieve this?

Thanks

---

Update 1:

I use this code: Fast way to get the min/max values among properties of object and Getting key with the highest value from object

but both return Max Value from string comparator

Please consider these Key-Value Pairs:

var dict_Numbers = {"96": "0",
                    "97": "1",
                    "98": "2",
                    "99": "1",
                    "100": "4",
                    "101": "0"}

I would like to get the highest value - in this example it would be 101.

How can I achieve this?

Thanks

---

Update 1:

I use this code: Fast way to get the min/max values among properties of object and Getting key with the highest value from object

but both return Max Value from string comparator

• javascript

Share Improve this question Follow edited Jul 5, 2021 at 17:48 Vlad L 1,68533 gold badges99 silver badges2222 bronze badges asked Dec 28, 2016 at 8:37 DooDooDooDoo 13.4k7070 gold badges189189 silver badges316316 bronze badges 5

• With 4k rep you should know to write a minimal reproducible example showing what you have tried. It is really not difficult to find examples here - Math.max and Object.keys – mplungjan Commented Dec 28, 2016 at 8:40
• Possible duplicate of Getting key with the highest value from object except that you've to use parseInt to convert the string to an integer. – Arun Kumar Mohan Commented Dec 28, 2016 at 8:42
• @ArunKumar No That code compare values not keys – DooDoo Commented Dec 28, 2016 at 8:43
• Can't you figure out how to compare keys instead of values from the answer I linked? See @mplungjan's answer. He has exactly done that. – Arun Kumar Mohan Commented Dec 28, 2016 at 8:47
• look at this minimal reproducible example: stackoverflow.com/questions/1669190/… – MKAD Commented Dec 28, 2016 at 8:49

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5 Answers 5

Sorted by: Reset to default 14

Nice example from MDN:

var dict_Numbers = {"96": "0",
                    "97": "1",
                    "98": "2",
                    "99": "3",
                    "100": "4",
                    "101": "5"}
                    
                    
function getMax(obj) {
  return Math.max.apply(null,Object.keys(obj));
}
console.log(getMax(dict_Numbers));

Applying to the keys the easily found Getting key with the highest value from object paying attention to the strings

const dict_Numbers = {
    "96": "0",
    "97": "1",
    "08": "8", // just to make sure
    "09": "9", // just to make sure
    "98": "2",
    "99": "3",
    "100": "4",
    "101": "5"
  },
  max = Object.keys(dict_Numbers)
  .reduce((a, b) => +a > +b ? +a : +b)
console.log(max)

But as I commented on the question, there is a neater way using Math.max on the Object.keys

Now even more elegant using spread

const dict_Numbers = {
    "96": "0",
    "97": "1",
    "08": "8", // just to make sure
    "09": "9", // just to make sure
    "98": "2",
    "99": "3",
    "100": "4",
    "101": "5"
  },
  max = Math.max(...Object.keys(dict_Numbers))
console.log(max)

var dict_Numbers = {"96": "0",
                    "97": "1",
                    "98": "2",
                    "99": "3",
                    "100": "4",
                    "101": "5"}

console.log(Math.max(...Object.keys(dict_Numbers)));

Note that this code uses ES6 features.

Try this.

You can iterate over the properties of the object and check for its value.

var dict_Numbers = {
  "96": "0",
  "97": "1",
  "98": "2",
  "99": "3",
  "100": "4",
  "101": "5"
};

var max = 0;

for (var property in dict_Numbers) {
  max = (max < parseFloat(property)) ? parseFloat(property) : max;
}

console.log(max);

var dict_Numbers = {
    "96": "0",
    "97": "1",
    "98": "2",
    "99": "3",
    "100": "4",
    "101": "5"
  },
  key,
  intKey,
  maxKey = 0;

for (key in dict_Numbers) {
  intKey = parseInt(key);
  if (intKey > maxKey) {
    maxKey = intKey;
  }
}
console.log(maxKey);

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