Delete from array in javascript

Question

3 hours ago, I asked a question in SO , about deleting a part of an object, so I linked this question to it:

but now another problem occurred when I deleted from that array. I use that object to populate a FlexiGrid. but when I delete an item from that object by following code, instead of delete that item , it sets to undefined :( and flexigrid did not accept it for input data.

for (var i = 0; i < Roomdata.length; i++) {

    if(Roomdata[i].id = X) {

        delete Roomdata[i];
        break;

    }
}

For example, imagine I have 3 items in Roomdata like this :

{item1, item2, item3}

When I call this code to delete item2 , Roomdata object looks like this :

{item1, undefined, item3}

and this is a bad format to be accepted by flexigrid as input data

Is there any solution ?

Thanks every body and sorry about my bad syntax (I am new in English)

regards , Foroughi

possible duplicate of JavaScript Array Delete Elements -- please use the search before you ask a question. — Felix Kling
The accepted answer to your previous question already suggest to use splice. Why do you ask this question again? — Felix Kling
Sorry @Felix , but I think because I asked a question about this issue already , I asked this question to help readers to read more understandable question ,anyway sorry about that — Ali Foroughi
@FelixKling , because i use that reply , but it not work , but i use his idea to solve my problem, so i accepted it not because his answer is correct , because his answer give me an idea — Ali Foroughi
@Rob: The duplicate answer shows how to delete an element form an array which was the question. I don't think we have to spoon feed every solution in detail. See also my comment to your answer. — Felix Kling

Rob W Rob W · Accepted Answer · 2012-02-20T14:05:20

Walk through the array in reverse order, and use .splice to remove the element.
You have to walk in the reverse order, because otherwise you end up skipping elements ^{See below}.

for (var i = Roomdata.length-1; i >= 0; i--) {
    if (Roomdata[i].id == X) {
        Roomdata.splice(i, 1);
        break;
    }
}

What happens if you don't walk in the reverse order:

// This happens in a for(;;) loop:
// Variable init:
var array = [1, 2, 3];
var i = 0;

array.splice(i, 1); // array = [2, 3]   array.length = 2
// i < 2, so continue
i++;  // i = 1    

array.splice(i, 1); // i=1, so removes item at place 1: array = [2]
// i < 1 is false, so stop.

// array = [2]. You have skipped one element.

Delete from array in javascript

3 Answers