Kotlin associate

According to the kotlin document, you can see that you have to implement that return Map.

inline fun <T, K, V> Sequence<T>.associate(
    transform: (T) -> Pair<K, V>
): Map<K, V>

It can be used as follows.

>>> listOf(1,2,3,4,5).associate { it to it * 2}
{1=2, 2=4, 3=6, 4=8, 5=10}