javascript find element from array and remove few from it

Question

I have a javascript array like below:

var arr = [ {RoomId:1, RoomName: 'ABC'},
            {RoomId:1, RoomName: 'ABC'},
            {RoomId:1, RoomName: 'ABC'},
            {RoomId:2, RoomName: 'XYZ'},
            {RoomId:2, RoomName: 'XYZ'},
            {RoomId:2, RoomName: 'XYZ'},
           ];

My requirement is something like

Find particular room with RoomId say RoomId = 1.
Remove last few elements from it like remove last 2 elements with RoomId = 1.

So my final array would be like:

var arr = [ {RoomId:1, RoomName: 'ABC'},                
            {RoomId:2, RoomName: 'XYZ'},
            {RoomId:2, RoomName: 'XYZ'},
            {RoomId:2, RoomName: 'XYZ'},
          ];

Just so you know, that's a JavaScript array. It has no connection with jQuery at all. — Michael Geary
– Michael Geary, Commented Jul 1, 2015 at 6:45
No apology needed! It's a common point of confusion. I just wanted to help you identify which is which. In any case I'm glad you asked the question, because I hadn't heard of the linq.js library that Anik mentioned - it looks very useful. — Michael Geary
– Michael Geary, Commented Jul 1, 2015 at 6:53

Anik Islam Abhi · Accepted Answer · 2015-07-01 06:26:18Z

2

You can use linq.js to maintain this kind of task

Like this

Find particular room with RoomId say RoomId = 1.

Code

var data =Enumerable.From(arr).Where(function(x){return x.RoomId===1;}).ToArray();

Remove last few elements from it like remove last 2 elements with RoomId = 1.

var data =Enumerable.From(arr).Where(function(x){return x.RoomId===1;}).OrderByDescending(function(x){return x.RoomId;}).Skip(2);

arr=data.OrderBy(function(x){return x.RoomId;}).ToArray();

edited Jul 1, 2015 at 6:26

answered Jul 1, 2015 at 5:38

Anik Islam Abhi

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15 Comments

pratik Over a year ago

Thanks, this is really useful, is it free to use and works on all browsers ? Also I forgot to mention that I don't want to make a new array. I want to do everything on same array.

Anik Islam Abhi Over a year ago

If you wanna hold on same variable your data will be lost

pratik Over a year ago

The last line in your code, I think it is retaining the same array right?

Anik Islam Abhi Over a year ago

Yes. it's replacing same array

pratik Over a year ago

data.OrderBy(...).toArray is not a function ... I am getting this error,

|

Sadikhasan · Accepted Answer · 2015-07-01 05:42:15Z

0

I developed logic for your query like

var destArr=[];
var flag=false;
var count=0;
for(i in arr)
{ 
    if(arr[i].RoomId==1 && flag==false)
    {
        flag = true;
        destArr[count++] = arr[i];              
    }
    else if(flag==true && arr[i].RoomId!=1)
    {
        destArr[count++] = arr[i];              
    }                                   
}   
console.log(destArr);

https://jsfiddle.net/oz6hw8qd/

answered Jul 1, 2015 at 5:42

Sadikhasan

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1 Comment

pratik Over a year ago

Thanks, I forgot to mention that I don't want to make a new array. I want to do everything on same array.

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