Push distinct item in Jquery

Question

I am trying to push only distinct value in jQuery. But it is not working

var arr = [];

for (var i = 0; i < a.length; i++) {
    if (arr.indexOf({
            A: a[i].City
        }) == -1)
        arr.push({
            A: a[i].City
        });
    else
        alert("a");
}

How do i get only distinct item in array?

`indexOf()` isn't going to do the job for you - two objects with the same values are still not the *same* object, so `indexOf()` will always return -1. — Paul Roub, Jun 01 '15 at 13:41
http://stackoverflow.com/questions/9229645/remove-duplicates-from-javascript-array?rq=1 — roland, Jun 01 '15 at 13:41
perhaps dublicated of http://stackoverflow.com/questions/1960473/unique-values-in-an-array — Alex Filatov, Jun 01 '15 at 13:42
http://stackoverflow.com/questions/12604062/javascript-array-indexof-doesnt-search-objects — AmmarCSE, Jun 01 '15 at 13:42

Balachandran · Answer 1 · 2015-06-01T13:54:23.183

0

create one new array like key then insert the value of city, next you have to check it the city values is present or not

var arr = [];
var key = [];  // make one dummy array 
for (var i = 0; i < a.length; i++) {
    if (key.indexOf(a[i].City) == -1) {
        arr.push({
            A: a[i].City
        });

        key.push(a[i].City); // push value to key
    } else{
        alert("a");
    }
}

edited Jun 01 '15 at 13:54

answered Jun 01 '15 at 13:47

Balachandran

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score 0 · Answer 2 · edited May 23 '17 at 12:06

Try following:

function inArray(needle, haystack) {
    var length = haystack.length;
    for(var i = 0; i < length; i++) {
        if(haystack[i] == needle) return true;
    }
    return false;
}

var arr = [];

a.forEach( function(item) {
    if (!in_array(item, arr)) {
        arr.push(item);
    }
});

in_array reference: JavaScript equivalent of PHP's in_array()

It looks if an item is existing and if it's distinct (doesn't exist) it push the item into the array.

Or the jQuery solution mentioned inside the comments: Remove Duplicates from JavaScript Array

Which is following:

var names = ["Mike","Matt","Nancy","Adam","Jenny","Nancy","Carl"];
var uniqueNames = [];
$.each(names, function(i, el){
    if($.inArray(el, uniqueNames) === -1) uniqueNames.push(el);
});

I posted the codes to ensure that someone finding this inside google finds some actual code and not just links that maybe are already down or closed.

Push distinct item in Jquery

2 Answers2