Kotlin HashMap entries.filter过滤forEach

Kotlin HashMap entries.filter过滤forEach

fun main(args: Array<String>) {val hashMap = HashMap<String, Int>()hashMap["a"] = 1hashMap["b"] = 2hashMap["c"] = 3println(hashMap)hashMap.entries.filter {println("filter ${it.key}-${it.value}")it.key == "b" //此处为过滤条件，满足过滤条件为真，才会进入forEach}.forEach {println("forEach ${it.key}--${it.value}")}
}

{a=1, b=2, c=3}
filter a-1
filter b-2
filter c-3
forEach b--2

kotlin协程flow filter map flowOn zip combine（1）_zhangphil的博客-CSDN博客一、flow ,emit,onCompletion,collect。四、map，重组改写数据。八、conflate 合并。九、debounce去重。二、函数作为flow。https://blog.csdn.net/zhangphil/article/details/130084723