associate
abstract fun <K, V, M : MutableMapWrapper<in K, in V>> associateByTo(destination: M, keySelector: (PT) -> K, valueTransform: (PT) -> V): M
将此数组的每个元素与其对应的键关联起来，并将结果添加到给定的 MutableMapWrapper 中.
参考 kotlin.collections.associateByTo