ES6使用reduce查找多个值的最大值

Question

我有以下方法找到信用额度最高的用户

let highest = this.users.reduce((max, current) => {
    current.credits > max.credits ? current : max, {credits: 0}
});

  

现在我想知道我怎么能看到谁拥有最高（积分+投注）

我尝试了以下但没有成功，我得到了未定义

let bestSupporter = this.users.reduce((max, current) => {
    (current.credits + current.shots) > (max.credits + max.shots) ? current : max, {credits: 0}
});

以下也无效（将镜头添加到初始值

let bestSupporter = this.users.reduce((max, current) => {
    (current.credits + current.shots) > (max.credits + max.shots) ? current : max, {credits: 0, shots: 0}
});

Answer 1

在箭头函数中使用花括号，您需要@Factory语句。

然后，您可以使用起始值来检查值

return

或省略起始值并直接使用对象。

let highest = this.users.reduce((max, current) => {
    return current.credits > max.credits ? current : max, 
}, { credits: 0 });

Answer 2

我认为你的逻辑没问题。

你没有返回新的累积器。

let bestSupporter = this.users.reduce((max, current) => {
    return (current.credits + current.shots) > (max.credits + max.shots) ? current : max, {credits: 0}
}, {/*Initialize a value for your accumulator*/}});

如果您不想在箭头功能中使用return，请删除大括号

let bestSupporter = this.users.reduce((max, current) => 
    (current.credits + current.shots) > (max.credits + max.shots) ? current : max, {credits: 0}
, {/*Initialize a value for your accumulator*/}});