Changing integer part of variable in while loop jQuery

Question

So I have a variable named c[insert integer here]_bool. The list of variables are:

        c1_bool =                                           false,
        c2_bool =                                           false,
        c3_bool =                                           false,
        c4_bool =                                           false,
        c5_bool =                                           false,
        c6_bool =                                           false,
        c7_bool =                                           false,
        c8_bool =                                           false,

I want to loop through these variables, and add another variable, like:

var iC = 1;

while( iC < 9 ){
 if( c[here comes iC]_bool ){
  //insert code
 } else {}
 iC ++;
}

How do I do that?

Rory McCrossan · Accepted Answer · 2016-04-07T08:47:17.030

0

While this is possible through the use of eval(), that is a hack and should not be used.

A better approach would be to set the flags as properties of an object. You can then use bracket notation to concatenate the name of the property. Try this:

var flags = {
    c1: false,
    c2: false,
    c3: false,
    c4: false,
    c5: false,
    c6: false,
    c7: false,
    c8: false
}

for (var i = 0; i <= Object.keys(flags).length; i++) {
    if (flags['c' + (i + 1)]) {
        // do something
    } else {}
}

Assuming there are no other properties in the object, you can just loop through it's keys:

for (var key in flags) {
    if (flags[key]) {
        console.log(key);
    } else {}
}

edited Apr 07 '16 at 08:47

answered Apr 07 '16 at 08:40

Rory McCrossan

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Or, frankly, an array. – T.J. Crowder Apr 07 '16 at 08:41
You typed flags['c' + iC]. That should be, in this case, flags['c' + iC + '_bool'] right? – Maarten Wolfsen Apr 07 '16 at 08:42
@T.J.Crowder true, although I didn't change the data structure as I assumed there was a reason the OP is using an object; other unmentioned properties perhaps. – Rory McCrossan Apr 07 '16 at 08:44
@MaartenWolfsen: Not with Rory's object, no, it leaves off the `_bool` part of the name. (If you include it, then yes, you'll want to add it back.) – T.J. Crowder Apr 07 '16 at 08:44
@MaartenWolfsen I removed the `_bool` from the property names as typed variable names are largely redundant. – Rory McCrossan Apr 07 '16 at 08:44
oh, yeah, I see. Well, it seems to have fixed the problem. Thank you very much! – Maarten Wolfsen Apr 07 '16 at 08:48
By the way, why is eval() not a good solution? – Maarten Wolfsen Apr 07 '16 at 08:49
http://stackoverflow.com/questions/86513/why-is-using-the-javascript-eval-function-a-bad-idea – Rory McCrossan Apr 07 '16 at 08:50

Changing integer part of variable in while loop jQuery

1 Answers1