Iterating an array

Question

I have framed an array like below

iArray = [true, true, false, false, false, false, false, false, true, true, true, false, 
true, false, false, false, false, true]

Condtional check: If anyone of the value in this array is false I will be showing an error message else if everything is true I will be showing success message.

I tired below code to iterate, however couldn't frame the logic in it.

var boolIteration = iArray.split(',');
var i;
for (i = 0; i < boolIteration.length; ++i) {
    //conditional check
}

I'm struggling to iterate the array using the above condition.

Can anyone point me in the right direction with an efficient solution.

iArray is already an array, why are you trying to split it like a string? — Niet the Dark Absol
– Niet the Dark Absol, Commented Sep 14, 2013 at 11:48
Erm, yeah! .split is to convert a string into an array by a separator! — Niet the Dark Absol
– Niet the Dark Absol, Commented Sep 14, 2013 at 11:52
@A.Wolff Though I wanted to do this JS. Since you have mentioned that indexOf has compatibility issue in IE, I will go with your jQuery solution. Thank you. — Praveen
– Praveen, Commented Sep 14, 2013 at 12:15

Oleg · Accepted Answer · 2013-09-14 12:06:10Z

4

No need for jQuery

if (iArray.indexOf(false) !== -1) {
    // error
}

Also, as previous commenters have already pointed out, iArray is already an array, there's no need to use split on it.

The Array.prototype.indexOf is not available in Internet Explorer below 9. However, this functionality could be easily added with a matching algorithm. See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf for compatibility and how to create a workaround.

edited Sep 14, 2013 at 12:06

answered Sep 14, 2013 at 11:50

Oleg

9,4092 gold badges45 silver badges59 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

A. Wolff Over a year ago

the only problem here is the lack of indexOf method for prototype array on older IE versions

Oleg Over a year ago

@A.Wolff You are absolutely right. Below IE9 indexOf is by default a no-no, but could be shimmed.

Ingo Bürk Over a year ago

… and a shim is still better than loading jQuery for something as simple as this. jQuery solutions are only preferable if jQuery is already being used anyway.

Praveen Over a year ago

+1 Thank you for showing me the approach in JS. Since I already using jQuery I will go with the above one.

Arun P Johny · Accepted Answer · 2013-09-14 11:49:20Z

2

iArray is already an array, so there is no need to split it again (split is a method for String, Arrays don't have it)

What you need to do is check the index of a false value, if it is there then there is a false value in the array.

using jQuery - the array indexOf is not used because of IE compatibility

iArray = [true, true, false, false, false, false, false, false, true, true, true, false, 
true, false, false, false, false, true] 
if($.inArray(false, iArray ) != -1){
    //error
}

answered Sep 14, 2013 at 11:49

Arun P Johny

389k68 gold badges532 silver badges532 bronze badges

1 Comment

Praveen Over a year ago

+1 I thought it would be indexOf, but jQuery has a pretty simple method to handle this. Thank you for your pointers.

Greenhorn · Accepted Answer · 2013-09-14 11:59:08Z

1

 var iArray = [true, true, false, false, false, false, false, false, true, true, 
true, false,true, false, false, false, false, true];

    for (var i = 0; i < iArray.length; i++) {
        if (iArray[i]) {
            alert("success");
        }
        else {
            alert("error");
        }
    }

edited Sep 14, 2013 at 11:59

Greenhorn

1,70011 silver badges12 bronze badges

answered Sep 14, 2013 at 11:51

Alexander Perechnev

2,8573 gold badges24 silver badges35 bronze badges

13 Comments

Niet the Dark Absol Over a year ago

i is less than an array? That's a new one.

Alexander Perechnev Over a year ago

Yes. If size of array is 10, then index of his last element will be 9. First element always has 0 as index.

Reinstate Monica Cellio Over a year ago

@Kolink You're just full of constructive criticism, aren't you?

Reinstate Monica Cellio Over a year ago

@AlexanderPerechnev He's trying to be funny and/or clever. What he should have said is that you should have put for (var i = 0; i < iArray.length; i++)

Reinstate Monica Cellio Over a year ago

@IngoBürk It doesn't work like that here. People will post almost anything just to get their answer in first, and then edit it to something (hopefully) correct later. It's called being point-hungry and this site is full of it. sadpanda.jpg

|

KooiInc · Accepted Answer · 2013-09-14 12:19:01Z

1

Aternatives:

if (/false/i.test(iArray)) { }

or

if ( ''.replace.call(iArray,/true|,/g,'').length ) { }

edited Sep 14, 2013 at 12:19

answered Sep 14, 2013 at 11:55

KooiInc

124k32 gold badges145 silver badges181 bronze badges

8 Comments

Niet the Dark Absol Over a year ago

.sort modifies the original array, it does NOT return the sorted array.

Ingo Bürk Over a year ago

Besides, sort has a worse performance than indexOf. Even iterating over the array would still be better, if you don't want to use indexOf.

Ingo Bürk Over a year ago

The new alternatives seem unnecessarily cryptic and complicated. Sure one can understand what they do, but not without having a look at it. What's the point of such solutions? When are they ever better than the "normal" solution(s)?

Oleg Over a year ago

You are entering the geek zone, beware :3

Ingo Bürk Over a year ago

If you just want "weird" solutions, here's another one: iArray.reduce(function (a,b) { return a && b; });.

|

Brandon Montgomery · Accepted Answer · 2013-09-14 12:02:17Z

0

The jQuery.inArray function is nice for checking to see if a particular value is contained within an array.

iArray = [true, true, false, false, false, false, false, false, true, true, true, false, true, false, false, false, false, true];
if ($.inArray(iArray, false) >= 0) {
  // the value "false" is contained within the array, show an error message
}

answered Sep 14, 2013 at 12:02

Brandon Montgomery

6,9853 gold badges50 silver badges71 bronze badges

Collectives™ on Stack Overflow

Iterating an array

5 Answers 5

4 Comments

1 Comment

13 Comments

8 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

4 Comments

1 Comment

13 Comments

8 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related