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:

delete a part of object in javascript

but now an

Answer 1

Using splice in spite of delete.

 Roomdata.splice(i, 0);

splice attribute removes blank string elements, undefined references, NULLs and FALSEs.

it will solve your problem

Answer 2

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.

Answer 3

What you have is an Array. You should use the splice() method to remove an element from an array, not by deleteing the element.

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

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

        Roomdata.splice(i, 1);
        break;

    }
}