Angular. Is it necessary to put code inside $apply?

Question

JavaScript

Greetings.
There are some places in the code where you need to use $apply. To avoid getting unnecessary errors, I check if $apply or $digest is currently running if(!scope.$phase && !scope.$root.$phase). Because of this condition, it becomes not very convenient to execute the code inside $apply, because you have to duplicate the code.

if(!scope.$phase && !scope.$root.$phase){
scope.$apply(function(){
/* some code  */
});
}else{
/* some code */
}

So now I'm using this design

/* some code */
if(!scope.$phase && !scope.$root.$phase){
scope.$apply();

What potential problems can arise if $apply is called after the code is executed?
Do I understand correctly that the call inside $apply is relevant for asynchronous code, but in the case of sequential execution, there should be no problems?

Answer 1

It's bad to do this https://github.com/angular/angular.js/wiki/Anti-Pa...
You can make it easier
$timeout(function() {
code
});
The effect will be the same. Well, all this is relevant for code that changes the state from the outside.

Answer 2

There doesn't seem to be any difference. I myself have been using the second method for quite a long time and have never had any problems because of this.

Answer 3

If your code doesn't cause infinite recursion/loops then there won't be any problems.
Unlike $timeout, this will be faster because +1 redrawing will occur with $timeout, $digest is restarted, and all this is delayed in time. Although in most cases it's all the little things.