Keep thy code stupid simple (KISS) - bad example

1st commandment - Keep thy code stupid simple - bad example

public boolean isTrue(boolean myBool){
    if(myBool){
        return true;
    }else{
        return false;
    }
}

public Map<Id,Contact> getContactMap(){
    Map<Id,Contact> contactMap = new Map<Id,Contact>();
    
    List<Contact> contacts = [Select Id From Contact];
    if(contacts != null && contacts.size() > 0 && !contacts.isEmpty()){
        for(Integer i=0; i < contacts.size(); i++){
            contactMap.put(contacts.get(i).Id,contacts.get(i));
        }
    }
    return contactMap;
}