select

Selects with the given key a Pair of the value and all routing parameters as Map.

Flow of the resulting Pair

key

for getting the value from the parameter Map

open fun select(key: String, orElse: String): Flow<String>

Returns the value for the given key from the routing parameters.

Flow of String with the value

key

for getting the value from the parameter Map

orElse

if key is not in Map