How to check duplicate value in an array by using jQuery?

Question

My array looks like this.

var qnsAnsArray = [];
var qnAnswer = { qn: a, points: curretnAnswerPoint };
qnsAnsArray.push(qnAnswer);

and the value getting in the array is

qnsAnsArray =[
    Object { qn=0, points="2"}, 
    Object { qn=1, points="2"}, 
    Object { qn=2, points="6"}, 
    Object { qn=2, points="2"}, 
    Object { qn=3, points="3"}
]

how will i get the duplicate 'qn' value by using jQuery? Each time when I change answer, I wants to update answer points instead of insertion into the array.

Thanks in advance.

whats your try? And what do you mean by dubplicate qn value? — Amit Joki
– Amit Joki, Commented Jan 30, 2015 at 5:30
I have got 10 question and 5 answers for each qn with answer points. When I go to the previous question , If I am changing the answer I wanted to replace with new answer points. — Nivya M
– Nivya M, Commented Jan 30, 2015 at 5:38

Nibin · Accepted Answer · 2015-01-30 06:02:50Z

4

The $.inArray() method is similar to JavaScript's native .indexOf() method in that it returns -1 when it doesn't find a match. If the first element within the array matches value, $.inArray() returns 0.Here we copy each item to another variable and checks it.Hope this helps u mate.. :)

var array = [{qn : 0, points : "2"}, {qn : 1, points :"2"}, {qn : 2, points : "6"}, {qn : 2, points : "2"}, {qn : 3, points : "3"}]
var temp = [];
$.each(array, function (key, value) {
   if($.inArray(value.qn, temp) === -1) {
        temp.push(value.qn);
    }else{
       console.log(value.qn+" is a duplicate value");
    }
});

Fiddle

FYI

jQuery.inArray()

answered Jan 30, 2015 at 6:02

Nibin

3,9602 gold badges22 silver badges40 bronze badges

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

2 Comments

random-forest-cat Over a year ago

we can't assume the questioner is using jquery

Nibin Over a year ago

he has tagged it in jquery isn't it mate..??

Pramod Karandikar · Accepted Answer · 2015-01-30 05:59:54Z

0

You can try if this works for you:

var arrayToTest = [{ qn:1, points:"2"}, { qn:1, points:"2"}, { qn:2, points:"6"}, { qn:2, points:"2"}, { qn:3, points:"3"}]
var uniqueQns = {};
var uniqueQnObj = [];


$.each(arrayToTest, function(i, ele) {

    if (!uniqueQns[ele.qn]) {
        uniqueQns[ele.qn] = true;
        uniqueQnObj.push(ele);
    } else {
        uniqueQns[ele.qn] = false;
    }
});

After running this, uniqueQns will contain : Object {1: false, 2: false, 3: true}. 1, 2, 3 represent qn and their corresponding value will depict it the qn is unique or not. 1: false means that qn1 has more than one occurrences.

answered Jan 30, 2015 at 5:59

Pramod Karandikar

5,3377 gold badges45 silver badges75 bronze badges

Comments

Parfait · Accepted Answer · 2015-01-30 06:00:17Z

0

function find_duplicate_value(objList, field) {

    if (objList.length == 0) 
        return null;

    var tmp = [];

    for (var i = 0; i < objList.length; i++) {
        var val = objList[i][field];
        var pos = tmp.indexOf(val)

        if (pos > -1) 
            return pos;

        tmp.push(val);
    }
    return null;
}

Is this what u want?

http://jsfiddle.net/Ly45g952/

answered Jan 30, 2015 at 6:00

Parfait

1,7501 gold badge11 silver badges12 bronze badges

Collectives™ on Stack Overflow

How to check duplicate value in an array by using jQuery?

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related