Checking first item of array in Javascript Goes Wrong

Question

I have an empty array named az and when I console.log(az), it returns this:

['']

Now I want to check that if az variable returns this [''] value, go to first condition, otherwise goto 2nd condition:

if(az[0] == null){
    console.log(1);
}else{
    console.log(2);
}

So when I run the if..else, I get 2 meaning that az[0] is not set to null

So what's going wrong here?

How can I properly if the variable az is set to null array (['']) properly?

Only undefined and null loosely equal(==) to null, try using if(!az[0]) as the condition. — Hao Wu
– Hao Wu, Commented Oct 18, 2022 at 6:50

Shahid · Accepted Answer · 2022-10-18 07:03:22Z

1

use "" (empty string) instead of null.

example:

if(arr[0] == ""){
    console.log(1);
}else{
    console.log(2);
}

answered Oct 18, 2022 at 7:03

Shahid

13010 bronze badges

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

2 Comments

marcellsimon Over a year ago

Though this answers the problem OP asked, BUT it's not an empty array check. it checks for a non-empty array if the first element is an empty string

Shahid yesterday

Yes, you’re right. I just provided an example based on the code the OP shared.

Pratham Dave · Accepted Answer · 2022-10-18 06:53:25Z

0

What I understood is, you want to print 1 if the list is empty, 2 if the list is not. For that you can do the following

if(az.length == 0)
{
   console.log(1);
}
else
{
   console.log(2);
}

Hope this helps

answered Oct 18, 2022 at 6:53

Pratham Dave

1332 silver badges12 bronze badges

Comments

Julian van Heek · Accepted Answer · 2022-10-21 06:57:15Z

0

This is how you check empty arrays

if(!az.length) {
   console.log("Empty array");
} else {
   console.log("Not an empty array");
}

edited Oct 21, 2022 at 6:57

answered Oct 18, 2022 at 6:59

Julian van Heek

524 bronze badges

4 Comments

Peter Amo Over a year ago

Although Not Working

Paul Ghiran Over a year ago

Why are you logging "empty array" in the second one as well?

Community Over a year ago

As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center.

Julian van Heek Over a year ago

@PaulGhiran sorry, I forgot to change the second log ^^

Collectives™ on Stack Overflow

Checking first item of array in Javascript Goes Wrong

3 Answers 3

2 Comments

Comments

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

Comments

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related