Question

我有以下代码来计算我的值集中的最高值：

var collection = [];

$histogram.find('li').each(function() {
    collection.push($(this).data());
});

component.props.collection = collection;

// Find Histogram max value
collection.hasMax = function(value) {
    return this.reduce(function(prev, curr) {
        return prev[value] > curr[value] ? prev : curr;
    });
};
// Assign Max Value
component.props.maxRange = collection.hasMax('value').value;

我需要创建一个相同的第二个函数，但对于最低值，例如名为hasMin的函数。我认为仅仅改变比较就足够了：

return prev[value] < curr[value] ? prev : curr;

但是我测试了它并且没有用，你可以帮助我吗？

Answer 1

JavaScript的内置Math对象具有静态 Math.min() 方法，它似乎可以解决您的问题，而无需您使用的所有代码。

您可以使用JavaScript的 destructuring assignment （将数组转换为以逗号分隔的值列表）获取数组的最低值，并将该列表传递给方法。

还有 Math.max() 。

let myData = [1,2,3,4,5,6,7,8,9,10];
console.log(Math.min(...myData));  
console.log(Math.max(...myData));

您已经指出collection是一个对象数组，每个对象都有一个value属性，您需要获取该对象数组中的最低值和最高值，这样就可以了：< / p>

// This is just set up to emulate your data structure. Don't add this:
var sth = "test", sth2 = "test", sth3 = "test";
let component = { props: {} };
let collection = [{value:0, label: sth},{value:1, label: sth2},{value:3, label:sth3}];

// Assuming your data structure is set up, the following will get you there:

// Loop over the array of objects, extracting the value property of each object into a new array
let vals = collection.map(function(obj){ 
   return obj.value; // Place the value of each object into an array
});

// Just set your object's properties to the min and max of the destructured array
component.props.minRange = Math.min(...vals);
component.props.maxRange = Math.max(...vals);

console.log(component.props.minRange, component.props.maxRange);

Answer 2

使用ES5：

let sth = "test", sth2 = "test", sth3 = "test";
let component = { props: {} };
let collection = [{value:0, label: sth},{value:1, label: sth2},{value:3, 
label:sth3}];

// Assuming your data structure is set up, the following will get you there:

// Loop over the array of objects, extracting the value property of each 
object into a new array
let vals = collection.map(function(obj){ 
   return obj.value; // Place the value of each object into an array
});

// Just set your object's properties to the min and max of the destructured array
component.props.minRange = Math.min.apply(Math,vals);
component.props.maxRange = Math.max.apply(Math,vals);

console.log(component.props.minRange, component.props.maxRange);

如何在JS中找到我的数组中的最低值？

2 个答案: