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
关心效率，但想在线实现
const s = new Set(array1);
array2.forEach(a => s.add(a));
const merged_array = [...s]; // optional: convert back in array type
其他回答
使用reduce func查看的另一种方法：
function mergeDistinct(arResult, candidate){
if (-1 == arResult.indexOf(candidate)) {
arResult.push(candidate);
}
return arResult;
}
var array1 = ["Vijendra","Singh"];
var array2 = ["Singh", "Shakya"];
var arMerge = [];
arMerge = array1.reduce(mergeDistinct, arMerge);
arMerge = array2.reduce(mergeDistinct, arMerge);//["Vijendra","Singh","Shakya"];
可以使用Set完成。
var array1=[“Vijendra”，“Singh”]；var array2=[“Singh”，“Shakya”]；var array3=array1.concat（array2）；var tempSet=新集合（array3）；array3=Array.from（tempSet）；//显示输出document.body.querySelector（“div”）.innerHTML=JSON.stringify（array3）；<div style=“width:100%；height:4rem；line height:4rem；background color:steelblue；color:#DDD；text align:center；font-family:Calibri”>临时文本</div>
如果不希望复制特定属性（例如ID）
let noDuplicate = array1.filter ( i => array2.findIndex(a => i.id==a.id)==-1 );
let result = [...noDuplicate, ...array2];
这是我需要合并（或返回两个数组的并集）时使用的函数。
var union = function (a, b) {
for (var i = 0; i < b.length; i++)
if (a.indexOf(b[i]) === -1)
a.push(b[i]);
return a;
};
var a = [1, 2, 3, 'a', 'b', 'c'];
var b = [2, 3, 4, 'b', 'c', 'd'];
a = union(a, b);
//> [1, 2, 3, "a", "b", "c", 4, "d"]
var array1 = ["Vijendra", "Singh"];
var array2 = ["Singh", "Shakya"];
var array3 = union(array1, array2);
//> ["Vijendra", "Singh", "Shakya"]
作为LiraNuna的一部分的单线解决方案：
let array1 = ["Vijendra","Singh"];
let array2 = ["Singh", "Shakya"];
// Merges both arrays
let array3 = array1.concat(array2);
//REMOVE DUPLICATE
let removeDuplicate = [...new Set(array3)];
console.log(removeDuplicate);
