3

I know a similar question has been asked here: Finding the max value of an attribute in an array of objects, but with that method there is no way to return the entire object containing the maximum.

I have this array of objects:

[ {Prop: "something", value: 2}, {Prop: "something_else", value: 5}, {Prop: "bla", value: 3} ] 

I want to find the maximum value over the property "value" and then I want to return the entire object

{Prop: "something_else", value: 5} 

What is the easiest way to do that in javascript?

6
  • 1
    Just loop through the array. Commented Nov 12, 2014 at 19:48
  • It's not enough. I would have done it otherwise. Commented Nov 12, 2014 at 20:00
  • Why is it not enough? Commented Nov 12, 2014 at 20:01
  • Better: I don't know how to find the maximum and keep track of the object within a loop. Commented Nov 12, 2014 at 20:05
  • Oh, see my answer, it's the easiest way, loop through elements and keep track of maximum and return that object. Commented Nov 12, 2014 at 20:10

5 Answers 5

3

The easiest way is to do this with reduce(). We can handle this in the minimum amount of steps needed, simply replacing the previous value if the current element's value is greater than the previous:

const objs = [ {Prop: "something", value: 2}, {Prop: "something_else", value: 5}, {Prop: "bla", value: 3} ]; const maxObj = objs.reduce((p, c) => p.value > c.value ? p : c); console.log(maxObj);

Don't sort your array! The main issue with sorting an array, is it causes many needless iterations through. This gets drastically slower the bigger your array is, sorting to try and move elements up and down.

Sign up to request clarification or add additional context in comments.

Comments

3

Could also use something like Array.prototype.reduce.

i.e.

function maxVal(arr) { return arr.reduce(function (prev, curr) { return (prev.value >= curr.value) ? prev : curr; }); } 

EDIT: If you want a basic way of doing it, simply by iterating through the array, you can do something like:

function maxVal(arr) { var max = arr[0]; for (var i = 1, iMax = arr.length; i < iMax; i++) { if (max.value < arr[i].value) { max = arr[i]; } } return max; } 

1 Comment

The first one works. The simpler one does not. There is no trace of "value". Thanks anyway.
0

If A is the array of objects.

function return_Max_Object(A) { var M = -Infinity; var Max_index = -1; for(var i =0;i<A.length;i++) { if(A[i].value>M) { M = A[i].value; Max_index = i; } } return A[Max_index]; } 

Comments

0

Try this:

array.slice().sort(function(a, b) { return a.value < b.value; })[0]; 

(slice clones the array)

Comments

0
function getMaxByVal(objArr){ var max=objArr[0]["value"]; var indexStore=0; var i=0; for(len=objArr.length; i<len;i++){ if(max < objArr[i]["value"]){ max=objArr[i]["value"]; indexStore=i; } } return objArr[indexStore]["value"] } 

1 Comment

This also works if you remove ["value"] at the end. I wanted the whole object.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.