copyMapToBy
inline fun <K, V, W, D : MutableMap<K, W>> Map<out K, V>.copyMapToBy(destination: D, transform: (Map.Entry<K, V>) -> W, resolve: (key: K, currentValue: W, newValue: V) -> W): D
Transforms values of entries of this map with the given transformation and copies resulting entries to the destination map merging present entries with new ones using resolve lambda. Is equivalent to
this.mapValues(transform).copyToBy(destination, resolve)Content copied to clipboard
Receiver
map to be transformed and copied.
Return
the destination.
Parameters
destination
map to receive copies.
transform
generates value of transformed entry using initial entry as an argument. Key of transformed entry is the same as initial entry.
resolve
lambda function that resolves overriding. It takes a key, current value corresponding to the key, and a new one and returns value to associate to the key.