lambda

src/senior/Lambda/Senior.kt

@@ -1,21 +1,5 @@
 package senior.Lambda;
 
-fun main(args: Array<String>) {
-    var range = 1..100
-    println("被5整除的")
-    println(range.pickNum { x: Int -> x % 5 == 0 })
-    println("被10整除的")
-    println(range.pickNum({ x: Int -> x % 10 == 0 }))
-    println(range.pickNum { x: Int -> x % 10 == 0 })
-    println("被15整除的")
-    println(range.pickNum { it % 15 == 0 })
-    println("移除指定数字")
-    println(range.removeNum(20,{x: Int -> x % 10 == 0}))
-    println(range.removeNum(50) { x: Int -> x % 10 == 0 })
-
-    println(range.removeNum(40) { it % 10 == 0 })
-}
-
 fun IntRange.pickNum(function: (Int) -> Boolean): List<Int> {
     val list: MutableList<Int> = mutableListOf()
     for (i in this) {
@@ -38,3 +22,35 @@ fun IntRange.removeNum(removeNumm: Int, func: (Int) -> Boolean): List<Int> {
     }
     return list
 }
+
+fun main(args: Array<String>) {
+    var range = 1..100
+    println("被5整除的")
+    println(range.pickNum { x: Int -> x % 5 == 0 })
+    println("被10整除的")
+    println(range.pickNum({ x: Int -> x % 10 == 0 }))
+    println(range.pickNum { x: Int -> x % 10 == 0 })
+    println("被15整除的")
+    println(range.pickNum { it % 15 == 0 })
+    println("移除指定数字")
+    println(range.removeNum(20, { x: Int -> x % 10 == 0 }))
+    println(range.removeNum(50) { x: Int -> x % 10 == 0 })
+
+    println(range.removeNum(40) { it % 10 == 0 })
+
+    println("svip price = " + getPrice(UserType.SVIP)(20.0))
+    println("normal price = " + getPrice(UserType.NORMAL)(20.0))
+}
+
+
+/**
+ * 返回值类型为函数
+ */
+
+fun getPrice(type: UserType): (Double) -> Double {
+    if (type == UserType.NORMAL) {
+        return { it }
+    } else {
+        return { price -> price * 0.8 }
+    }
+}

src/senior/Lambda/UserType.kt

@@ -0,0 +1,13 @@
+package senior.Lambda
+
+/**
+ * todo Created with IntelliJ IDEA
+ *
+ *
+ * @author luming
+ * @email: lu.lm@bitsun-inc.com
+ * @date 2021/7/1 11:41
+ */
+enum class UserType {
+    NORMAL,SVIP
+}