LeetCode 题解工作台
包装数组
创建一个名为 ArrayWrapper 的类,它在其构造函数中接受一个整数数组作为参数。该类应具有以下两个特性: 当使用 + 运算符将两个该类的实例相加时,结果值为两个数组中所有元素的总和。 当在实例上调用 String() 函数时,它将返回一个由逗号分隔的括在方括号中的字符串。例如, [1,2,3…
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题型
1
代码语言
0
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简单 · 数组·wrapper·core·interview·pattern
答案摘要
class ArrayWrapper { private nums: number[];
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题目描述
创建一个名为 ArrayWrapper 的类,它在其构造函数中接受一个整数数组作为参数。该类应具有以下两个特性:
- 当使用
+运算符将两个该类的实例相加时,结果值为两个数组中所有元素的总和。 - 当在实例上调用
String()函数时,它将返回一个由逗号分隔的括在方括号中的字符串。例如,[1,2,3]。
示例 1:
输入:nums = [[1,2],[3,4]], operation = "Add" 输出:10 解释: const obj1 = new ArrayWrapper([1,2]); const obj2 = new ArrayWrapper([3,4]); obj1 + obj2; // 10
示例 2:
输入:nums = [[23,98,42,70]], operation = "String" 输出:"[23,98,42,70]" 解释: const obj = new ArrayWrapper([23,98,42,70]); String(obj); // "[23,98,42,70]"
示例 3:
输入:nums = [[],[]], operation = "Add" 输出:0 解释: const obj1 = new ArrayWrapper([]); const obj2 = new ArrayWrapper([]); obj1 + obj2; // 0
提示:
0 <= nums.length <= 10000 <= nums[i] <= 1000注意:nums 是传递给构造函数的数组。
解题思路
方法一
class ArrayWrapper {
private nums: number[];
private s: number;
constructor(nums: number[]) {
this.nums = nums;
this.s = nums.reduce((a, b) => a + b, 0);
}
valueOf() {
return this.s;
}
toString() {
return `[${this.nums}]`;
}
}
/**
* const obj1 = new ArrayWrapper([1,2]);
* const obj2 = new ArrayWrapper([3,4]);
* obj1 + obj2; // 10
* String(obj1); // "[1,2]"
* String(obj2); // "[3,4]"
*/
复杂度分析
| 指标 | 值 |
|---|---|
| 时间 | Depends on the final approach |
| 空间 | Depends on the final approach |
面试官常问的追问
外企场景- question_mark
Candidate demonstrates familiarity with JavaScript class methods and operator overloading.
- question_mark
Candidate uses efficient array manipulation techniques.
- question_mark
Candidate handles edge cases like empty arrays properly.
常见陷阱
外企场景- error
Not handling empty arrays or incorrect assumptions about array lengths.
- error
Misusing JavaScript’s built-in methods for operator overloading.
- error
Failing to test edge cases like arrays with different sizes.
进阶变体
外企场景- arrow_right_alt
Change the operation to subtract arrays instead of adding them.
- arrow_right_alt
Allow custom operations (e.g., multiplication) between ArrayWrapper objects.
- arrow_right_alt
Implement a compare function to check if two ArrayWrapper objects are equal.