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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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简单 · 数组·wrapper·core·interview·pattern

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答案摘要

class ArrayWrapper { private nums: number[];

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description

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 <= 1000
  • 0 <= nums[i] <= 1000
  • 注意:nums 是传递给构造函数的数组。
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解题思路

方法一

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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]"
 */
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复杂度分析

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时间Depends on the final approach
空间Depends on the final approach
psychology

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.

warning

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.

swap_horiz

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.

help

常见问题

外企场景

包装数组题解:数组·wrapper·core·intervi… | LeetCode #2695 简单