A straightforward way to convert aListofMapsto aMapgrouped by keys is to use a simplefor()loop: fun groupByUsingForLoop(input: List<Map<String, String>>): Map<String, List<String>> { val result = mutableMapOf<String, MutableList<String>>() for (map in input) { for ((key, value)...
Similarly, we create a list of pairs that contain anullvalue. Subsequently, we supply thefilter()method with a predicate function that removes any pair with anullvalue. Finally, we convert the list to a map after filtering using thetoMap()method. ...
Convert Map to List val keyList = ArrayList(mmp.keys) val valueList = ArrayList(mmp.values) println("Key List: $keyList") // Key List: [1, 3, 2, 4] println("Value List: $valueList") // Value List: [aone, three, two, four] val list = mmp.toList().map { "${it.first}_...
funmain(args:Array<String>){dataclassCombine(val alpha:String,val num:Int)val list=arrayListOf(...
We used map's keySet() method to get all the keys and created an ArrayList keyList from them. Likewise, we used map's values() method to get all the values and created an ArrayList valueList from them.Here's the equivalent Java code: Java Program to convert map to a list....
toSortedMap(Comparator { o1, o2 -> println("o1=$o1,o2=$o2") if (o1 > o2) 1 else if (o1 < o2) -1 else 0 }) println(sortedMap) // {1=aone, 2=two, 3=three, 4=four} Convert Map to List 代码语言:javascript 复制 val keyList = ArrayList(mmp.keys) val valueList = ...
Cmdb.ListRequest.newBuilder().setProduct(cmdbProduct).build() ).productsList.map{product-> CmdbProductConverterImpl().convertToCmdbProduct(product) } 1. 2. 3. 4. 5. 上面的代码转化为一句话 CmdbProductConverterImpl().convertToCmdbProduct(product) ...
Convert Map (HashMap) to List Convert Array to Set (HashSet) and Vice-Versa Sort a Map By Values Kotlin Tutorials Convert Array to Set (HashSet) and Vice-Versa Convert Character to String and Vice-Versa Convert Map (HashMap) to List Convert Byte Array to Hexadecimal Convert Fi...
我们使用map的keySet()方法获取所有键,并从中创建一个ArrayList键列表。同样,我们使用map的values()方法获取所有值,并从中创建一个ArrayList valueList。 以下是等效的Java代码:用于将map转换为list的Java程序。 Kotlin 实例大全 Kotlin 实例大全
inline 关键字适合修饰不太复杂的但会频繁调用的函数。所以 Kotlin 自带的操作符都是 inline 函数,我们如果要自定义一个操作符,也是需要修饰为 inline 函数。如下就是自定义了一个 convert 操作符,功能类似集合中的 map 函数。 // code 6inlinefun<T,E>Iterable<T>.convert(action:(T)->E):Iterable<E>{val...