使用Array.prototype.filter方法是另一种常见的数组去重方法。这种方法虽然不如 Set 方法直接,但它在处理更复杂的去重逻辑时显得更为灵活。 const uniqueNumbers = numbers.filter((item, index, array) => array.indexOf(item) === index); console.log(uniqueNumbers); // 输出: [1, 2, 3, 4, 5] 这...
unique: 数组去重,返回一个新数组 functionunique(arr){if(!isArrayLink(arr)){//不是类数组对象returnarr }letresult = []letobjarr = []letobj =Object.create(null) arr.forEach(item=>{if(isStatic(item)){//是除了symbol外的原始数据letkey = item +'_'+getRawType(item);if(!obj[key]){ obj...
Different methods to get unique array in JavaScript Method-1: Use theSetobject Within the JavaScript environment, there is a native and built-in object calledSet, which allows us to store unique values of any data type. The collections of values within aSetobject may only occur once, and the...
Array.prototype.unique=function() {// 原数组先排序this.sort();// 构建一个新数组存放结果varnewArray = [];for(vari =1; i <this.length; i++) {// 检查原数组中的第i个元素与结果中的最后一个元素是否相同// 因为排序了,所以重复元素会在相邻位置if(this[i] !== newArray[newArray.length-1...
function uniqueObjectArray(arr, key) { let unique = []; let seen = new Set(); for(let i = 0; i < arr.length; i++) { if(!seen.has(arr[i][key])) { seen.add(arr[i][key]); unique.push(arr[i]); } } return unique; } let objects = [{id: 1, name: 'Alice'}, {id...
[Tips + Javascript] Make a unique array To make an array uniqued, we can use Set() from Javascript. const ary = ["a", "b", "c", "a", "d", "c"]; console.log(newSet(ary)); We can see that all the duplicated value have been removed, now the only thing we need to do ...
javascript中对象的排列 JSON对象中的排列 如何用随机值注释每个对象 以图形形式排列的对象 如何用php统计json对象的值的总和 按对象键/值的字母顺序排列Array.sort Pandas列值的排序排列? 不带对象的访问方法(如static) 根据选定的id排列对象数组 具有相等对象的列表的排列- Java ...
Previous:Creates an object from an array, using the specified key and excluding it from each value. .Next:Permutations of an array elements What is the difficulty level of this exercise? Based on 25 votes, average difficulty level of this exercise is Easy . ...
Since: ArcGIS Maps SDK for JavaScript 4.25 Removes a group of handles owned by the object. Parameter groupKey * optional A group key or an array or collection of group keys to remove. Example obj.removeHandles(); // removes handles from default group obj.removeHandles("handle-group")...
Returns an object containing an array of unique values queried from a given field (or values returned from an expression) in a Layer along with the total count of features that belong to the given category. uniqueValues Method Details uniqueValues Method uniqueValues(params){Promise<Uni...