From 59e95dc3a5f80af5d852d42659625f77131a66f8 Mon Sep 17 00:00:00 2001
From: Zhou Fang <wamaker.scorpion@gmail.com>
Date: Mon, 21 Jun 2021 22:57:15 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E6=9B=B4=E6=96=B0=20swift=20tour=20?=
 =?UTF-8?q?=E4=BB=A3=E7=A0=81=E5=8F=98=E6=9B=B4=20(#1138)?=
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---
 source/01_welcome_to_swift/03_a_swift_tour.md | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/source/01_welcome_to_swift/03_a_swift_tour.md b/source/01_welcome_to_swift/03_a_swift_tour.md
index b58eab60..844dd657 100755
--- a/source/01_welcome_to_swift/03_a_swift_tour.md
+++ b/source/01_welcome_to_swift/03_a_swift_tour.md
@@ -97,8 +97,8 @@ print(shoppingList)
 使用初始化语法来创建一个空数组或者空字典。
 
 ```swift
-let emptyArray = [String]()
-let emptyDictionary = [String: Float]()
+let emptyArray: [String] = []
+let emptyDictionary: [String: Float] = [:]
 ```
 
 如果类型信息可以被推断出来，你可以用 `[]` 和 `[:]` 来创建空数组和空字典——比如，在给变量赋新值或者给函数传参数的时候。
@@ -187,7 +187,7 @@ let interestingNumbers = [
     "Square": [1, 4, 9, 16, 25],
 ]
 var largest = 0
-for (kind, numbers) in interestingNumbers {
+for (_, numbers) in interestingNumbers {
     for number in numbers {
         if number > largest {
             largest = number
@@ -195,11 +195,12 @@ for (kind, numbers) in interestingNumbers {
     }
 }
 print(largest)
+// 输出 "25"
 ```
 
 > 练习
 > 
-> 添加另一个变量来记录最大数字的种类（kind），同时仍然记录这个最大数字的值。
+> 将 _ 替换成变量名，以确定哪种类型的值是最大的。
 
 使用 `while` 来重复运行一段代码直到条件改变。循环条件也可以在结尾，保证能至少循环一次。
 
@@ -771,7 +772,7 @@ print(fridgeIsOpen)
 
 ```swift
 func makeArray<Item>(repeating item: Item, numberOfTimes: Int) -> [Item] {
-    var result = [Item]()
+    var result: [Item] = []
     for _ in 0..<numberOfTimes {
         result.append(item)
     }