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Simplify the code in array.swift (#960)

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* 简单点

* Apply suggestions from code review

Co-authored-by: nuomi1 <nuomi1@qq.com>

---------

Co-authored-by: Yudong Jin <krahets@163.com>
Co-authored-by: nuomi1 <nuomi1@qq.com>
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0x6AcE 2023-11-23 15:20:17 +08:00 committed by GitHub
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commit c5e37c1b41
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1 changed files with 2 additions and 3 deletions
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codes/swift/chapter_array_and_linkedlist/array.swift
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@ -28,7 +28,7 @@ func extend(nums: [Int], enlarge: Int) -> [Int] {
/* 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 }) {
for i in nums.indices.dropFirst(index).reversed() {
nums[i] = nums[i - 1]
}
// 将 num 赋给 index 处元素
@ -37,9 +37,8 @@ func insert(nums: inout [Int], num: Int, index: Int) {
/* 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 }) {
for i in nums.indices.dropFirst(index).dropLast() {
nums[i] = nums[i + 1]
}
}