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@@ -2141,6 +2141,100 @@ To enhance our understanding of how lists work, we will attempt to implement a s
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}
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```
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=== "Ruby"
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```ruby title="my_list.rb"
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### 列表类 ###
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class MyList
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attr_reader :size # 获取列表长度(当前元素数量)
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attr_reader :capacity # 获取列表容量
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### 构造方法 ###
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def initialize
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@capacity = 10
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@size = 0
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@extend_ratio = 2
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@arr = Array.new capacity
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end
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### 访问元素 ###
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def get(index)
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# 索引如果越界,则抛出异常,下同
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raise IndexError, "索引越界" if index < 0 || index >= size
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@arr[index]
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end
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### 访问元素 ###
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def set(index, num)
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raise IndexError, "索引越界" if index < 0 || index >= size
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@arr[index] = num
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end
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### 在尾部添加元素 ###
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def add(num)
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# 元素数量超出容量时,触发扩容机制
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extend_capacity if size == capacity
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@arr[size] = num
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# 更新元素数量
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@size += 1
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end
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### 在中间插入元素 ###
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def insert(index, num)
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raise IndexError, "索引越界" if index < 0 || index >= size
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# 元素数量超出容量时,触发扩容机制
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extend_capacity if size == capacity
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# 将索引 index 以及之后的元素都向后移动一位
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for j in (size - 1).downto(index)
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@arr[j + 1] = @arr[j]
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end
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@arr[index] = num
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# 更新元素数量
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@size += 1
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end
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### 删除元素 ###
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def remove(index)
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raise IndexError, "索引越界" if index < 0 || index >= size
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num = @arr[index]
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# 将将索引 index 之后的元素都向前移动一位
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for j in index...size
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@arr[j] = @arr[j + 1]
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end
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# 更新元素数量
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@size -= 1
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# 返回被删除的元素
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num
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end
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### 列表扩容 ###
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def extend_capacity
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# 新建一个长度为原数组 extend_ratio 倍的新数组,并将原数组复制到新数组
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arr = @arr.dup + Array.new(capacity * (@extend_ratio - 1))
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# 更新列表容量
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@capacity = arr.length
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end
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### 将列表转换为数组 ###
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def to_array
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sz = size
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# 仅转换有效长度范围内的列表元素
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arr = Array.new sz
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for i in 0...sz
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arr[i] = get i
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end
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arr
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end
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end
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```
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=== "Zig"
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```zig title="my_list.zig"
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