From 662371f85de7dee6c002dfc722c40ad7158e2838 Mon Sep 17 00:00:00 2001
From: luming <lu.lm@bitsun-inc.com>
Date: Thu, 1 Jul 2021 14:15:54 +0800
Subject: [PATCH] =?UTF-8?q?=E5=85=83=E7=B4=A0=E6=9F=A5=E6=89=BE?=
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---
 src/senior/Lambda/Collection.kt | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 src/senior/Lambda/Collection.kt

diff --git a/src/senior/Lambda/Collection.kt b/src/senior/Lambda/Collection.kt
new file mode 100644
index 0000000..76d80e4
--- /dev/null
+++ b/src/senior/Lambda/Collection.kt
@@ -0,0 +1,33 @@
+package senior.Lambda
+
+/**
+ * 集合
+ *
+ */
+
+fun main(args: Array<String>) {
+    val list = listOf(20, 1, 2, 3, 4, 5, 6, 7, 8, 8, 9, 33, 12, 74, 23, 21)
+    println("list = $list")
+
+    // 查找
+    println("list = $list")
+    // 只会返回查找到的第一个元素
+    println("element > 2 = ${list.find { it > 2 }}")
+
+    // 查找满足条件的第一个元素 未找到会抛异常
+    println("element > 2 = ${list.first { it > 2 }}")
+
+    // 查找满足条件的最后一个元素 未找到会抛异常
+    println("element < 33 = ${list.last { it < 33 }}")
+
+    // 查找到的结果超过1个将会异常
+    println("element single one = ${list.single { it == 9 }}")
+
+    // takewile只有第一个元素满足条件才能继续向下查找
+    println("element > 10 = ${list.takeWhile { it > 2 }}")
+    println("element > 10 = ${list.takeWhile { it > 20 }}")
+
+    // 查找所有满足条件的元素
+    println("element > 10 = ${list.filter { it >= 20 }}")
+
+}
\ No newline at end of file