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?

if you start i at 0, you should use i < itemsAll not <=. For example if there are 10 items and you start at i=0 you'd want to stop at i=9 — Peter Ajtai
– Peter Ajtai, Commented Jul 19, 2010 at 5:20

S73417H · Accepted Answer · 2010-07-19 05:53:53Z

10

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.

edited Jul 19, 2010 at 5:53

answered Jul 19, 2010 at 5:38

S73417H

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1 Comment

Hans Keﬆing Over a year ago

+1 for the reverse loop, because the 'removeItem' may cause the remaining items to be renumbered. Although the loop should probably start from itemAll-1 and continue when i>=0.

patros · Accepted Answer · 2010-07-19 05:28:51Z

0

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);
}

answered Jul 19, 2010 at 5:28

patros

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Comments

Nitin Kumar · Accepted Answer · 2016-07-27 17:14:18Z

0

We can solve the problem using continue statement too.Detail about continue can be found here and a very simple use of continue can be seen here

var current = 2;
for(var i = 0; i<=itemsAll; i++) {
    if( i === current) { continue; }
    removeItem(i);
}

answered Jul 27, 2016 at 17:14

Nitin Kumar

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