拥抱kotlin之如何习惯使用kotlin高阶函数

 tV.setOnClickListener {
   //doSomeThing
  }

listOf(1, 2, 3)
   .filter { it > 2 }
   .map { it + 5 }

/**
 * Returns a list containing only elements matching the given [predicate].
 */
public inline fun <T> Iterable<T>.filter(predicate: (T) -> Boolean): List<T> {
 return filterTo(ArrayList<T>(), predicate)
}

fun filter(): Boolean {
  if (classA) {
   return true
  } else if (classB) {
   return false
  }
  return false
 }

interface IJudge {
  fun canFilter(): Boolean
 }

 class ClassA : IJudge {
  override fun canFilter(): Boolean {
   return true
  }
 }

 class ClassB : IJudge {
  override fun canFilter(): Boolean {
   return false
  }
 }

 fun filter(a:Int,b:Int,jugde: IJudge): Boolean {
  //加一些逻辑
  return jugde.canFilter()
 }

  fun filter(a: Int, b: Int, canFilter: (a:Int,b:Int) -> Boolean): Boolean {
  //加一些逻辑
  return canFilter(a,b)
 }
  //调用方1
  filter(1, 2) { a: Int, b: Int ->
   a * b > 10
  }
  //调用方2
  filter(1, 2) { a: Int, b: Int ->
   a + b < 5
  }

kt:
  fun filter(a: Int, b: Int, canFilter: (a:Int,b:Int) -> Boolean): Boolean {
    //加一些逻辑
    return canFilter(a,b)
  }
java:
 public final boolean filter(int a, int b, @NotNull Function2 canFilter) {
   Intrinsics.checkParameterIsNotNull(canFilter, "canFilter");
   canFilter.invoke(a, b);
   return (Boolean)canFilter.invoke(a, b);
  }

operator fun invoke(vararg args: Any?): R