我有两个JavaScript数组:

var array1 = ["Vijendra","Singh"];
var array2 = ["Singh", "Shakya"];

我希望输出为:

var array3 = ["Vijendra","Singh","Shakya"];

输出数组应删除重复的单词。

如何在JavaScript中合并两个数组,以便从每个数组中只获得唯一的项目,其顺序与它们插入原始数组的顺序相同?


当前回答

/***对仅保留唯一值的数组进行重复数据消除。*使用哈希表(js对象)过滤重复项。*保持数组元素的顺序。*该算法对于大型阵列(线性时间)特别有效。*/函数数组UniqueFast(arr){var seen={};var结果=[];变量i,长度=arr.length;对于(i=0;i<len;i++){var项目=arr[i];//哈希表查找if(!seed[item]){result.push(项);seed[项目]=真;}}返回结果;}/////测试var array1=[“Vijendra”,“Singh”];var array2=[“Singh”,“Shakya”];var result=arrayUniqueFast(array1.concat(array2));document.write('<br>result:'+result);

有关阵列重复数据消除的其他方法,请参阅我的基准测试:https://jsperf.com/de-duplicate-an-array-keeping-only-unique-values

其他回答

var arr1 = [1, 3, 5, 6];
var arr2 = [3, 6, 10, 11, 12];
arr1.concat(arr2.filter(ele => !arr1.includes(ele)));
console.log(arr1);

output :- [1, 3, 5, 6, 10, 11, 12]

ES 6版本

试试这个。。。这应该能解决你的问题

var array1=[“Vijendra”,“Singh”];var array2=[“Singh”,“Shakya”];

var输出=[…new Set([…array1,…array2])]

console.log(“合并数组”,输出)

DeDuplicate单个或Merge和DeDupliplicate多个数组输入。示例如下。

使用ES6-设置,用于,销毁

我编写了一个接受多个数组参数的简单函数。与上面的解决方案几乎相同,只是有更实际的用例。此函数不会将重复的值连接到一个数组中,以便在稍后阶段删除它们。

短功能定义(仅9行)

/**
* This function merging only arrays unique values. It does not merges arrays in to array with duplicate values at any stage.
*
* @params ...args Function accept multiple array input (merges them to single array with no duplicates)
* it also can be used to filter duplicates in single array
*/
function arrayDeDuplicate(...args){
   let set = new Set(); // init Set object (available as of ES6)
   for(let arr of args){ // for of loops through values
      arr.map((value) => { // map adds each value to Set object
         set.add(value); // set.add method adds only unique values
      });
   }
   return [...set]; // destructuring set object back to array object
   // alternativly we culd use:  return Array.from(set);
}

使用示例代码笔:

// SCENARIO 
let a = [1,2,3,4,5,6];
let b = [4,5,6,7,8,9,10,10,10];
let c = [43,23,1,2,3];
let d = ['a','b','c','d'];
let e = ['b','c','d','e'];

// USEAGE
let uniqueArrayAll = arrayDeDuplicate(a, b, c, d, e);
let uniqueArraySingle = arrayDeDuplicate(b);

// OUTPUT
console.log(uniqueArrayAll); // [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 43, 23, "a", "b", "c", "d", "e"]
console.log(uniqueArraySingle); // [4, 5, 6, 7, 8, 9, 10]

在当今时代,使用现有的图书馆提供更简单、更优雅的内容:

import {pipe, concat, distinct} from 'iter-ops';

// our inputs:
const array1 = ['Vijendra', 'Singh'];
const array2 = ['Singh', 'Shakya'];

const i = pipe(
    array1,
    concat(array2), // adding array
    distinct() // making it unique
);

console.log([...i]); //=> ['Vijendra', 'Singh', 'Shakya']

这两者都是高性能的,因为我们只迭代一次,而且代码非常容易阅读。

注:我是iter ops的作者。

您可以合并结果并过滤重复项:

let combinedItems = [];

// items is an Array of arrays: [[1,2,3],[1,5,6],...]    
items.forEach(currItems => {
    if (currItems && currItems.length > 0) {
        combinedItems = combinedItems.concat(currItems);
    }
});

let noDuplicateItems = combinedItems.filter((item, index) => {
    return !combinedItems.includes(item, index + 1);
});