3种JavaScript中删除重复数组值的简单方法 原文|https://medium.com/code-85/three-easy-ways-to-remove-duplicate-array-values-in-javascript-97131baeba7a 原译| 小爱 有多种方法可以删除数组中的重复值。在开始使用推荐的方法之前,先问问自己你使用的是哪个...
TheSetobject lets you store unique values of any type, whether primitive values or object references. MDN Set Documentation new Set()accepts an iterable as an argument (see MDN Set Syntax section), a JavaScript Array is iterable (seethe iterable protocol on MDN). Sets are also iterable themselv...
With this method, we do not have to initially define an empty array. Thefilter()method will return an array so we just assign this array to a value. letmyData=[ 1,2,2,4,5,5,5,7,'Hello','World',true,false];letduplicateValues=myData.filter((item,index)=>{returnmyData.indexOf(i...
Ajavascript objectconsists of key-value pairs where keys are unique. If you try to add a duplicate key with a different value, then the older value for that key is overwritten by the new value. With this concept, we can easily find out if an array contains duplicate values using below ...
Write a JavaScript function to remove. 'null', '0', '""', 'false', 'undefined' and 'NaN' values from an array. Sample array : [NaN, 0, 15, false, -22, '',undefined, 47, null] Expected result : [15, -22, 47] Click me to see the solution ...
{// 'unused' is the only place where 'priorThing' is referenced,// but 'unused' never gets invokedif(priorThing) {console.log("hi"); } }; theThing = {longStr:newArray(1000000).join('*'),// Create a 1MB objectsomeMethod:function() {console.log(someMessage); } }; };setInterval...
Example 1: Sum of All Values of Array constnumbers = [1,2,3,4,5,6];functionsum_reducer(accumulator, currentValue){returnaccumulator + currentValue; } letsum = numbers.reduce(sum_reducer); console.log(sum);// 21 // using arrow functionletsummation = numbers.reduce((accumulator, currentVa...
* values() 获取MAP中所有VALUE的数组(ARRAY) * keys() 获取MAP中所有KEY的数组(ARRAY) * **/functionMap() {this.elements =newArray();//获取MAP元素个数this.size =function() {returnthis.elements.length; };//判断MAP是否为空this.isEmpty =function() {return(this.elements.length < 1); ...
A very simple way to remove all duplicate values from the array. This function converts the array to a Set, and then returns the array. const uniqueArr = (arr) => [...new Set(arr)]; console.log(uniqueArr([1, 2, 3, 1, 2, 3, 4, 5])); // [1, 2, 3, 4, 5] 05-Chec...
log(removeDuplicate([1, 2, 3, 3])); // Result: [ 1, 2, 3, ]Swap variables or valuesconst swap = (a, b) => [b, a]; let a = 1, b = 2; [b, a] = swap(a, b); console.log(a, b); // 2, 1Remove element from array...