Optimize if statement when checking for false (if(variable){} equivalent for false)

Context : I am trying to optimize my code for a reactjs project that I am working on using expo. In one of my if else statements, one boolean variable's value is changed based on whether any of multiple other boolean variables are false. I wanted to make this much more optimized and remove unnecessary code since its for a mobile app.

My question is : Is there a way to make an if statement shorter while checking whether a variable is false?

if(variable){}

is the same as

if(variable === true){}

Is there a way like this for false as well? Maybe something like

if(!variable){}

I'm not exactly sure and couldn't find any method similar to what I showed above anywhere online (yet).

Example of the code I have right now :

var example = false

if(var1 === false || var2 === false || var3 === false || var4 == false){
example = true
}

if any of the variables are false (hence the ||), it should switch over

Thanks in advance!