// Providing no default value
// Results in a nullable return type, caller has to do null handling
val id: String = requireArguments().getString("user_id")!!

// Providing a (meaningless) default value
// Results in a platform return type, caller has to explicitly type as non-null
val id: String = requireArguments().getString("user_id", "")
if (id == "") { ... } // ... and check to avoid accidentally using the default value

val id: String = requireArguments().requireString("user_id")

val userId: String? = requireArguments().getStringOrNull("user_id")

val extras: Bundle = intent.requireExtras()

// Primitives (examples)
intent.requireBooleanExtra()
intent.requireByteExtra()
intent.requireCharExtra()
intent.requireDoubleExtra()
intent.requireFloatExtra()

// Reference types
intent.requireStringExtra()
intent.requireBundleExtra()
intent.requireCharSequenceExtra()
intent.requireParcelableExtra()
intent.requireSerializableExtra()

// Arrays (examples)
intent.requireBooleanArrayExtra()
intent.requireByteArrayExtra()
intent.requireCharArrayExtra()
intent.requireDoubleArrayExtra()
intent.requireFloatArrayExtra()

val args: Bundle = navBackStackEntry.requireArguments()

class SomeWorker : Worker() {
    override fun doWork(): Result {
        // Values
        inputData.requireBoolean()
        inputData.requireByte()
        inputData.requireDouble()
        inputData.requireFloat()
        inputData.requireInt()
        inputData.requireLong()
        inputData.requireString()

        // Arrays
        inputData.requireBooleanArray()
        inputData.requireByteArray()
        inputData.requireDoubleArray()
        inputData.requireFloatArray()
        inputData.requireIntArray()
        inputData.requireLongArray()
        inputData.requireStringArray()

        // ...
    }
}