log(uniqueObjects); 上述代码中,我们使用objects.map(JSON.stringify)将对象转换为字符串,然后通过Set去除重复的字符串,最后再通过Array.from将字符串转换回对象。 使用Lodash的uniqBy函数:Lodash是一个流行的JavaScript工具库,它提供了许多实用的函数。其中,uniqBy函数可以根据指定的属性获取唯一对象。示例代码如下: 代码...
/** *unique the array *@param {Array} array array to unique *@return {Array} uniqued array ,note change parameter */ function undulpicate(array){ for(var i=0;i<array.length;i++) { for(var j=i+1;j<array.length;j++) { //注意 === if(array[i]===array[j]) { array.splice...
API:https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array javaScript的Array对象是用于构造数组的全局对象,数组类似于列表的高阶对象。在javaScript的数组中,元素没有任何限制 , 可以保存所有类型,如: vara =['test',123,false, [1,3,3], {id:1, value: 3},null, unde...
function uniqueArray(arr){ return [...new Set(arr)] } 这个方法是最简单的，他是利用set ...
1. Object.entries方法 Object.entries 方法返回一个给定对象自身可枚举属性的键值对数组。 代码语言:javascript 复制 constobject={key1:'value1',key2:'value2'}constarray=Object.entries(object)// [ ["key1", "value1"], ["key2", "value2"] ]...
For example, let’s create an array with duplicate values, create a new one with unique values using the Set() function, and show the result on the console using the console.log() function in JavaScript. See the code below.var myArray = ['c', 'b', 'c', 2, 'b']; var unique...
Method 1: Get Unique Values from Array Using for Loop For getting unique values, the easiest and most commonly used method is the “for” loop. It will iterate the complete array, extract the unique elements, and remove the duplicate elements if occurred. ...
An object that contains the unique values returned from the uniqueValues() query of a layer's field. Properties uniqueValueInfos Object[] An array of objects, each containing a unique value/type/category present in the field specified in the uniqueValues() query. See table below for...
if ([0] && []) { // true // an array (even an empty one) is an object, objects will evaluate to true }15.3 Use shortcuts for booleans, but explicit comparisons for strings and numbers. // bad if (isValid === true) { // ... } // good if (isValid) { // ... } /...
constarray=[1,1,2,3,5,5,1];constuniqueArray=[...newSet(array)];console.log(uniqueArray);// [1, 2, 3, 5] 6.检查对象是否为空 constobj={};console.log(!!obj);// 总是返回true,即使对象是空的consttotalKeys=Object.keys(obj).length;// 返回一个对象中键的总数console.log(totalKeys?