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Hi there , what is difference between object and companion object in singleton pattern ? and what's good way ? , Do both methods have no problem when using? !!!

This Kotlinlang page describes the companion object's benefits over regular objects <https://kotlinlang.org/docs/object-declarations.html#companion-objects>

Mostly that you can reference it by just the classname, e.g. `Counter` will point to it

In your code examples though, you could just omit the nested `object` entirely, and make `Counter` itself an object, if you want it to be a singleton instance

There is a subtle difference between the declarations in terms of object creation time -
```object MySingleton {
}```
and
```class SomeClass {
    companion object {
    }
}```
The `companion object` will get created when the first instance of `SomeClass` is created.  In the case of the Kotlin singleton object, it will be created _when it is first used_.