比较 JavaScript 对象数组以获取最小值/最大值-前端问题

Compare JavaScript Array of Objects to Get Min / Max(比较 JavaScript 对象数组以获取最小值/最大值)

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问题描述

我有一个对象数组，我想在特定对象属性上比较这些对象.这是我的数组:

I have an array of objects and I want to compare those objects on a specific object property. Here's my array:

var myArray = [
    {"ID": 1, "Cost": 200},
    {"ID": 2, "Cost": 1000},
    {"ID": 3, "Cost": 50},
    {"ID": 4, "Cost": 500}
]

我想特别将成本"归零并获得最小值和最大值.我意识到我可以获取成本值并将它们推送到 javascript 数组中，然后运行 Fast JavaScript Max/Min.

I'd like to zero in on the "cost" specifically and a get a min and maximum value. I realize I can just grab the cost values and push them off into a javascript array and then run the Fast JavaScript Max/Min.

但是，有没有更简单的方法可以绕过中间的数组步骤并直接关闭对象属性(在本例中为Cost")?

However is there an easier way to do this by bypassing the array step in the middle and going off the objects properties (in this case "Cost") directly?

推荐答案

一种方法是遍历所有元素并将其与最高/最低值进行比较.

One way is to loop through all elements and compare it to the highest/lowest value.

(创建一个数组，调用数组方法对于这个简单的操作来说太过分了).

 // There's no real number bigger than plus Infinity
var lowest = Number.POSITIVE_INFINITY;
var highest = Number.NEGATIVE_INFINITY;
var tmp;
for (var i=myArray.length-1; i>=0; i--) {
    tmp = myArray[i].Cost;
    if (tmp < lowest) lowest = tmp;
    if (tmp > highest) highest = tmp;
}
console.log(highest, lowest);

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