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kotlinlang

What this message means  'Modifier factory functions must use the receiver Modifier instance' When writing a modifier like    fun Modifier.myModifier(i:Int):Modifier{ return Modifier.border(BorderStroke(1.dp,Color.Blue),RoundedCornerShape(6.dp))}   It works as expected ...

Probably means you have a function that returns a modifier, but you’re not chaining it to the incoming modifier (specified as the extension receiver). Might be missing a `then`

Thank you so much, but why then it works?

Modifier chaining doesn’t happen by magic. Under the hood, it’s all:
```Modifier
  .then(modifier1)
  .then(modifier2)
  .then(etc)```
If you factor out modifier2 into an extension function like:
```fun Modifier.modifier2(): Modifier =
  modifier2```
Then you lose that chaining: `modifier2` throws away `modifier1`. To preserve the chaining you need to keep using `then`:
```fun Modifier.modifier2(): Modifier =
  then(modifier2)```

So nice!!  Thank you again (btw very nice articles about state)