for Loop with if-else statement.

Question

I would like to ask some logic question here.

Let say I have a for loop in javascript to remove the whole items:-

var i = 0;
for (i=0;i<=itemsAll;i++) {
    removeItem(i);
}

I do not want to remove item when i = current = e.g. 2 or 3.

how do I or where do I add a if-else statement in this current for loop?

Please help, anyone?

Answer 1

You can use an if test in your for loop as already suggested, or you can split your for loop in two.

x = Math.min(current, itemsAll);
for(i=0;i<x;++i){
   removeItems(i);
}
for(i=x+1; i<itemsAll;++i)
{
   removeItems(i);
}

Answer 2

Iterate over it in reverse order and only remove the items which does not equal the current item.

var current = 2;

var i = 0;
for (i=itemsAll-1;i>=0;i--) {
    if (i != current) {
        removeItem(i);
    }
}

I probably should have stated the reason for the reverse loop. As Hans commented, the loop is done in reverse because the 'removeItem' may cause the remaining items to be renumbered.