feat: add Swift codes for array article

codes/swift/Package.swift

@@ -9,6 +9,7 @@ let package = Package(
         .executable(name: "worst_best_time_complexity", targets: ["worst_best_time_complexity"]),
         .executable(name: "space_complexity", targets: ["space_complexity"]),
         .executable(name: "leetcode_two_sum", targets: ["leetcode_two_sum"]),
+        .executable(name: "array", targets: ["array"]),
     ],
     targets: [
         .target(name: "utils", path: "utils"),
@@ -16,5 +17,6 @@ let package = Package(
         .executableTarget(name: "worst_best_time_complexity", path: "chapter_computational_complexity", sources: ["worst_best_time_complexity.swift"]),
         .executableTarget(name: "space_complexity", dependencies: ["utils"], path: "chapter_computational_complexity", sources: ["space_complexity.swift"]),
         .executableTarget(name: "leetcode_two_sum", path: "chapter_computational_complexity", sources: ["leetcode_two_sum.swift"]),
+        .executableTarget(name: "array", path: "chapter_array_and_linkedlist", sources: ["array.swift"]),
     ]
 )

codes/swift/chapter_array_and_linkedlist/array.swift

@@ -0,0 +1,103 @@
+/**
+ * File: array.swift
+ * Created Time: 2023-01-05
+ * Author: nuomi1 (nuomi1@qq.com)
+ */
+
+// 随机返回一个数组元素
+func randomAccess(nums: [Int]) -> Int {
+    // 在区间 [0, nums.count) 中随机抽取一个数字
+    let randomIndex = nums.indices.randomElement()!
+    // 获取并返回随机元素
+    let randomNum = nums[randomIndex]
+    return randomNum
+}
+
+// 扩展数组长度
+func extend(nums: [Int], enlarge: Int) -> [Int] {
+    // 初始化一个扩展长度后的数组
+    var res = Array(repeating: 0, count: nums.count + enlarge)
+    // 将原数组中的所有元素复制到新数组
+    for i in nums.indices {
+        res[i] = nums[i]
+    }
+    // 返回扩展后的新数组
+    return res
+}
+
+// 在数组的索引 index 处插入元素 num
+func insert(nums: inout [Int], num: Int, index: Int) {
+    // 把索引 index 以及之后的所有元素向后移动一位
+    for i in sequence(first: nums.count - 1, next: { $0 > index + 1 ? $0 - 1 : nil }) {
+        nums[i] = nums[i - 1]
+    }
+    // 将 num 赋给 index 处元素
+    nums[index] = num
+}
+
+// 删除索引 index 处元素
+func remove(nums: inout [Int], index: Int) {
+    let count = nums.count
+    // 把索引 index 之后的所有元素向前移动一位
+    for i in sequence(first: index, next: { $0 < count - 1 - 1 ? $0 + 1 : nil }) {
+        nums[i] = nums[i + 1]
+    }
+}
+
+// 遍历数组
+func traverse(nums: [Int]) {
+    var count = 0
+    // 通过索引遍历数组
+    for _ in nums.indices {
+        count += 1
+    }
+    // 直接遍历数组
+    for _ in nums {
+        count += 1
+    }
+}
+
+// 在数组中查找指定元素
+func find(nums: [Int], target: Int) -> Int {
+    for i in nums.indices {
+        if nums[i] == target {
+            return i
+        }
+    }
+    return -1
+}
+
+@main
+enum _Array {
+    // Driver Code
+    static func main() {
+        // 初始化数组
+        let arr = Array(repeating: 0, count: 5)
+        print("数组 arr = \(arr)")
+        var nums = [1, 3, 2, 5, 4]
+        print("数组 nums = \(nums)")
+
+        // 随机访问
+        let randomNum = randomAccess(nums: nums)
+        print("在 nums 中获取随机元素 \(randomNum)")
+
+        // 长度扩展
+        nums = extend(nums: nums, enlarge: 3)
+        print("将数组长度扩展至 8 ，得到 nums = \(nums)")
+
+        // 插入元素
+        insert(nums: &nums, num: 6, index: 3)
+        print("在索引 3 处插入数字 6 ，得到 nums = \(nums)")
+
+        // 删除元素
+        remove(nums: &nums, index: 2)
+        print("删除索引 2 处的元素，得到 nums = \(nums)")
+
+        // 遍历数组
+        traverse(nums: nums)
+
+        // 查找元素
+        let index = find(nums: nums, target: 3)
+        print("在 nums 中查找元素 3 ，得到索引 = \(index)")
+    }
+}