Using corresponding functions simplifies your code.

The quick-fix replaces the safe cast with if type check.

Example:

  fun test(x: Any) {
      x as? String ?: return
  }

After the quick-fix is applied:

  fun test(x: Any) {
      if (x !is String) return
  }

Analogously, it detects unsafe casts in form

    fun foo(o: Any) {
    o as String ?: return
}

and transforms into a type check:

    fun foo(o: Any) {
    if (o !is String) return
}