From 474e096e07601f010e8212916ab8b448361f2290 Mon Sep 17 00:00:00 2001
From: YangJ0605 <1442122744@qq.com>
Date: Fri, 12 Jun 2020 18:10:24 +0800
Subject: [PATCH] map set

---
 "set\344\270\216map/map.js" |  7 +++++++
 "set\344\270\216map/set.js" | 24 ++++++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 "set\344\270\216map/map.js"
 create mode 100644 "set\344\270\216map/set.js"

diff --git "a/set\344\270\216map/map.js" "b/set\344\270\216map/map.js"
new file mode 100644
index 0000000..3513e78
--- /dev/null
+++ "b/set\344\270\216map/map.js"
@@ -0,0 +1,7 @@
+// map解决了js对象的键只能是字符串的问题
+const m = new Map()
+const o = { name: 'object' }
+m.set(o, 1)
+m.get(o)
+
+console.log(m.has(o))
\ No newline at end of file
diff --git "a/set\344\270\216map/set.js" "b/set\344\270\216map/set.js"
new file mode 100644
index 0000000..8ee6a1a
--- /dev/null
+++ "b/set\344\270\216map/set.js"
@@ -0,0 +1,24 @@
+// Set函数可以接受一个数组（或者具有 iterable 接口的其他数据结构）作为参数，用来初始化。
+
+// let set = new Set()
+// let a = NaN
+// let b = NaN
+// set.add(a).add(b).add(1)
+// console.log(set)
+// console.log(set.size)
+// console.log(set.keys())
+// console.log(set.values())
+
+
+// 数组并集
+let arr = [1, 2, 3, 4, 5]
+let arr2 = [3, 4, 5, 78, 9]
+console.log([...new Set([...arr, ...arr2])])
+
+// 数组交集
+console.log(arr.filter(item => new Set(arr2).has(item)))
+
+// WeakSet 只能存放对象
+const ws = new WeakSet()
+ws.add({ a: 1 })
+console.log(ws)
\ No newline at end of file