is null , undefined and false data types in javascript?

Question

Are Null, Undefined and false are same in data types in javascript ?

if(null){
    //This code won't work
 }

if(false){
   //This code won't work
}

if(undefined){
   //This code won't work
}

are they same theoretically ?

null is an Object. false is a Boolean. undefined is of type undefined. But they have in common the fact that they are all falsy values. Which means that when they are converted to Booleans (implicitely or explicitely), they translate to false, which is why none of your if conditions pass. The same would happen to 0, or an empty String "" — blex
– blex, Commented Jan 23, 2021 at 11:06

pynode · Accepted Answer · 2021-01-23 12:26:05Z

2

So they are different.

answered Jan 23, 2021 at 12:26

pynode

4442 silver badges7 bronze badges

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

Comments

koko-js478 · Accepted Answer · 2021-01-23 12:46:27Z

1

Internally, JavaScript sets a value to one of six primitive data types:

answered Jan 23, 2021 at 12:32

koko-js478

2,04111 silver badges18 bronze badges