Js - 解决挑战 Range Sum Query - Immutable with creating object and its properties

Question

我正在查看 leetcode 站点上的问题，发现一个我不知道如何解决的问题。他们是这样解释的：

Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive.

Example: Given nums = [-2, 0, 3, -5, 2, -1]

sumRange(0, 2) -> 1 sumRange(2, 5) -> -1 sumRange(0, 5) -> -3 Note: You may assume that the array does not change. There are many calls to sumRange function.

这是代码：

/**
 * @param {number[]} nums
 */
var NumArray = function(nums) {
   this.nums = nums;
};

/** 
 * @param {number} i 
 * @param {number} j
 * @return {number}
 */
NumArray.prototype.sumRange = function(i, j) {
    let sum = 0;
    for (i; i <= j; i++) {
        sum += this[i];
    }
    return sum;
};

/** 
 * Your NumArray object will be instantiated and called as such:
 * var obj = Object.create(NumArray).createNew(nums)
 * var param_1 = obj.sumRange(i,j)
 */

我不知道该怎么做，或者这部分到底是什么意思：

var obj = Object.create(NumArray).createNew(nums)

我是否应该创建一个属性 createNew 来接受 mums 和 creats 以及数组，如果 nums 已经作为数组发送，我为什么要这样做？

Answer 1

what exactly it means is this part:
var obj = Object.create(NumArray).createNew(nums)

他们把它搞砸了，意思很简单 var obj = new NumArray(nums)（对于像 JS 这样的函数式语言来说，这仍然是不必要的复杂）。

显然，描述在某些时候被一些无知的人更改了，因为讨论部分（例如 this one）中所有旧的 JavaScript 提交在评论中都有正确的代码。

Js - 解决挑战 Range Sum Query - Immutable with creating object and its properties

Js - solving challenge Range Sum Query - Immutable with creating object and its properties

javascript

object-create