CODEWITHSUNDEEP
javascriptjqueryarrays
user3559224
user3559224

Reputation:

How can i get most repeated value from Array in javascript

How can I get the most repeated value from an Array in javascript?

This is my array 

var data = [
    { values: "Number of pips" }, 
    { values: 4 }, 
    { values: 4 }, 
    { values: 4 }, 
    { values: 5 }, 
    { values: 2 }, 
    { values: 6 }, 
    { values: 6 },
    { values: 5 }
];

The result should be 4, how can I get this?

I have tried this, taken from Get the element with the highest occurrence in an array

function mode(array)
{
    if(array.length == 0)
        return null;
    var modeMap = {};
    var maxEl = array[0], maxCount = 1;
    for(var i = 0; i < array.length; i++)
    {
        var el = array[i];
        if(modeMap[el] == null)
            modeMap[el] = 1;
        else
            modeMap[el]++;    
        if(modeMap[el] > maxCount)
        {
            maxEl = el;
            maxCount = modeMap[el];
        }
    }
    return maxEl;
}

but this is return 6, not 4.

Upvotes: 1

Views: 2463

Answers (3)

musefan
musefan

Reputation: 48465

The problem with your attempted code is that you do not have an array of numbers, you have an array of objects. If you want to count the most values then you have to use that value, rather than the whole object.

In regards to the code you have attempted, you just need to change the following line:

var el = array[i].values;

Here is the full code:

function mode(array)
{
    if(array.length == 0)
        return null;
    var modeMap = {};
    var maxEl = array[0], maxCount = 1;
    for(var i = 0; i < array.length; i++)
    {
        var el = array[i].values;// This is the change.
        if(modeMap[el] == null)
            modeMap[el] = 1;
        else
            modeMap[el]++;  
        if(modeMap[el] > maxCount)
        {
            maxEl = el;
            maxCount = modeMap[el];
        }
    }
    return maxEl;
}

Here is a working example

Upvotes: 3

cracker
cracker

Reputation: 4906

I Got This

var arr= [{ values: "Number of pips" }, { values: 4 }, { values: 4 }, { values: 4 }, { values: 5 }, { values: 2 }, { values: 6 }, { values: 6 }, { values: 5 }];



    var uniqs = {};

    for(var i = 0; i < arr.length; i++) {
        uniqs[arr[i].values] = (uniqs[arr[i].values] || 0) + 1;
    }

    var max = { val: arr[0], count: 1 };
    for(var u in uniqs) {
        if(max.count < uniqs[u]) { max = { val: u, count: uniqs[u] }; }
    }

    alert(max.val);

DEMO

Upvotes: 2

Zo72
Zo72

Reputation: 15355

  1. Sort the array. (I assume you can do that... else copy it first on another array)
  2. iterate the array and by keeping the previouslyVisited item work this out

Upvotes: -1

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