javascript switch using intervals

Question

Can I use intervals in a switch statement?

Like

switch (parseInt(troops[i])) {
                case <10:
                    editbox.style.fontSize = "13px";
                    break;
                case <100:
                    editbox.style.fontSize = "12px";
                    break;
                case <1000:
                    editbox.style.fontSize = "8px";
                    editbox.size = 3;
                    //editbox.style.width = "18px";
                    break;
                default:
                    editbox.style.fontSize = "10px";
            }

???

score 24 · Accepted Answer · answered Jun 08 '10 at 01:01

24

This should work though:

var j = parseInt(troops[i]);
switch (true) {
            case (j<10):
                editbox.style.fontSize = "13px";
                break;
            case (j<100):
                editbox.style.fontSize = "12px";
                break;
            case (j<1000):
                editbox.style.fontSize = "8px";
                editbox.size = 3;
                //editbox.style.width = "18px";
                break;
            default:
                editbox.style.fontSize = "10px";
        }

answered Jun 08 '10 at 01:01

Cahit

2,484
19
23

clever! (this is filler, 15 char min argh!) – Rob Jun 08 '10 at 01:07
2

To be safe, you should include a radix argument when using parseInt(). So: `parseInt(troops[i],10)` can avoid some maddening bugs. For example, if troops[i] happens to have a value of "010", js guesses the radix as 2. Probably not what you want. – Ken Redler Jun 08 '10 at 04:48

score 3 · Answer 2 · answered Jun 08 '10 at 00:52

3

No. switch can be used only with discrete values. For ranges you'll have to use an if statement.

var val = parseInt(troops[i]);
if (val < 10) {
    editbox.style.fontSize = "13px";
} else if (val < 100) { 
    // ...
} else {
}

answered Jun 08 '10 at 00:52

VoteyDisciple

37,319
5
97
97

+1 for the correct answer. +1 again, if I could, for spelling discrete correctly. ;-) – T.J. Crowder Jun 08 '10 at 00:54

score 2 · Answer 3 · answered Jun 08 '10 at 04:41

2

Sometimes a switch is too much like work

var j= parseInt(troops[i]),
val= j<10? 13: j<100? 12: j<1000? 8: 10;

editbox.style.fontSize= val+'px';
if(val== 8) editbox.size= 3;

answered Jun 08 '10 at 04:41

kennebec

102,654
32
106
127

javascript switch using intervals

3 Answers3