有一个名为 householdArray
的数组,其中填充有两个属性的对象:第一个是 isSelling
,其值为 true
>或假
。第二个是askingPrice
,它的值是一个数字。还有另一个名为 buyer
的对象,它有一个带有数值的 budget
属性。
如何在 householdArray
中具有 isSelling === true
的所有对象中找到具有最高 askingPrice
的对象在买家
的预算
之内吗?
最佳答案
您可以使用过滤器和最小值最大值,但我会利用 Array.prototype.reduce() 在 O(n) 时间内一次性完成这项工作。为了鼓励您使用箭头函数,我将首先向您展示箭头,然后向您展示传统的函数实现。
请注意,我们使用像 {isSelling: true, AskPrice: 0}
这样的对象作为归约操作的初始值。
var buyer = {budget:1000},
household = [{ isSelling: true,
askingPrice: 500},
{ isSelling: false,
askingPrice: 500},
{ isSelling: true,
askingPrice: 1000},
{ isSelling: true,
askingPrice: 790},
{ isSelling: false,
askingPrice: 1000},
{ isSelling: true,
askingPrice: 1200},
{ isSelling: false,
askingPrice: 690},
{ isSelling: true,
askingPrice: 890},
{ isSelling: true,
askingPrice: 1500},
{ isSelling: true,
askingPrice: 790},
{ isSelling: true,
askingPrice: 900},
{ isSelling: true,
askingPrice: 990},
{ isSelling: false,
askingPrice: 990},
{ isSelling: true,
askingPrice: 670}
],
result = household.reduce((p,c) => c.isSelling === true &&
c.askingPrice <= buyer.budget &&
c.askingPrice > p.askingPrice ? c : p,{isSelling: true, askingPrice: 0});
console.log(result);
现在有了传统的函数实现
var buyer = {budget:1000},
household = [{ isSelling: true,
askingPrice: 500},
{ isSelling: false,
askingPrice: 500},
{ isSelling: true,
askingPrice: 670},
{ isSelling: true,
askingPrice: 790},
{ isSelling: false,
askingPrice: 1000},
{ isSelling: true,
askingPrice: 1200},
{ isSelling: false,
askingPrice: 690},
{ isSelling: true,
askingPrice: 890},
{ isSelling: true,
askingPrice: 1500},
{ isSelling: true,
askingPrice: 790},
{ isSelling: true,
askingPrice: 900},
{ isSelling: true,
askingPrice: 990},
{ isSelling: false,
askingPrice: 990},
{ isSelling: true,
askingPrice: 1000}
],
result = household.reduce(function(p,c){
return c.isSelling === true &&
c.askingPrice <= buyer.budget &&
c.askingPrice > p.askingPrice ? c : p
},{isSelling: true, askingPrice: 0});
console.log(result);
如果您想获取符合我们条件的记录索引,只需将索引参数添加到reduce回调中,并使用初始值“0”,如下所示;
var buyer = {budget:1000},
household = [{ isSelling: false,
askingPrice: 1500},
{ isSelling: false,
askingPrice: 500},
{ isSelling: true,
askingPrice: 1000},
{ isSelling: true,
askingPrice: 670},
{ isSelling: true,
askingPrice: 790},
{ isSelling: false,
askingPrice: 1000},
{ isSelling: true,
askingPrice: 1200},
{ isSelling: false,
askingPrice: 690},
{ isSelling: true,
askingPrice: 890},
{ isSelling: true,
askingPrice: 1500},
{ isSelling: true,
askingPrice: 790},
{ isSelling: true,
askingPrice: 900},
{ isSelling: true,
askingPrice: 990},
{ isSelling: false,
askingPrice: 990}
],
result = household.reduce(function(p,c,i,a){
return a[p].isSelling === false ||
a[p].askingPrice > buyer.budget ||
c.isSelling === true &&
c.askingPrice <= buyer.budget &&
c.askingPrice > a[p].askingPrice ? i : p;
},0);
result = household[result].isSelling === true && household[result].askingPrice <= buyer.budget ? result : -1;
console.log(result);
关于javascript - 在 Javascript 中,如何在满足某些条件的情况下查找数组中具有最高值的特定属性的对象,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38709425/