CODEWITHSUNDEEP
javascriptif-statementlocal-storage
AcidicProgrammer
AcidicProgrammer

Reputation: 204

How can I refer to local storage as empty?

I have a series of if and else if statements and what I want is to determine a scenario in terms of local storage being empty.

I've tried:

(if localStorage.getItem('example') == localStorage.clear()) {

//Do something if that local storage item is empty
}

I am aware the program may think I'm assigning the local storage to clear out it's contents. So would I do something like:

(if localStorage.getItem('example') == localStorage()) {

//Do something if that local storage item is empty
}

If not, how can I refer to the local storage as an empty object so the program doesn't get confused thinking that I'd like to clear the contents in the storage?

Upvotes: 0

Views: 158

Answers (3)

Reality
Reality

Reputation: 677

Ok both answers posted are right. However, I want to explain a few things that I have experienced. Undefined is returned if you are referring to the object as so and it has nothing in it:

localStorage.key; //will be undefined if not set

localStorage.getItem() returns null if nothing is in it (as I have experienced).

localStorage.getItem('key'); //will return null if not set

And yes, all you have to do is check if it is null or undefined (depending on the method you use)

if(localStorage.getItem('key') === null){
   //do stuff here
}

or

if(localStorage.key === undefined){
   //do stuff here
}

or you can use the ! operator like so:

if(!localStorage.getItem('key')){
   //do stuff here
}

or

if(!localStorage.key){
   //do stuff here
}

The reason for this is because both null and undefined are falsely values, and the ! operator checks for falsely values

Upvotes: 1

imvain2
imvain2

Reputation: 15867

You can check to see if it is null.

if(localStorage.getItem('example') === null){
 console.log("x");
}

Upvotes: 2

AlexH
AlexH

Reputation: 866

You can just check if localStorage.getItem() is undefined. Here's an example:

function isCleared(item) {
  return !localStorage.getItem(item)
}

Upvotes: 0

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