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in this code

```if( ! condition ){ if( ! another_condition ){ //do something } }

the second if( ! another_condition ) will be called only in the 1st condition was true.

In this code

```if(condition){
     //return
}
if(another_condition){
    //return
}
//do something

you will call 1st if and the 2nd regardless of the 1st one.

Just choose the case you need.