My react developer tool popped up to tell me that my company slack is using the development build of react not fit for production...

What do people like more?
if(condition){
return true;
} else{
return false;
}

Or just

if(condition){
return true;
}
return false;

During a code review I was told that
if(x and y){
if(z){}
}

Will be slower to run than
if(x and y and z){}

I mean if you want to talk about programming practices and uniform code yes absolutely but any compiler will treat these identically, not to mention the assembly being identical. She was a superior though so I just went along with it.