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?
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
var a = [1,2,3]
var b = [1,2,4,5]
我喜欢一行。这将把不同的b元素推到
b.forEach(item => a.includes(item) ? null : a.push(item));
另一个版本不会修改
var c = a.slice();
b.forEach(item => c.includes(item) ? null : c.push(item));
其他回答
我认为这工作得更快。
removeDup = a => {
for (let i = a.length - 1; i >= 0; i--) {
for (let j = i-1; j >= 0; j--) {
if (a[i] === a[j])
a.splice(j--, 1);
}
}
return a;
}
以下是带有对象数组的对象的选项:
const a = [{param1: "1", param2: 1},{param1: "2", param2: 2},{param1: "4", param2: 4}]
const b = [{param1: "1", param2: 1},{param1: "4", param2: 5}]
var result = a.concat(b.filter(item =>
!JSON.stringify(a).includes(JSON.stringify(item))
));
console.log(result);
//Result [{param1: "1", param2: 1},{param1: "2", param2: 2},{param1: "4", param2: 4},{param1: "4", param2: 5}]
我简化了这个答案的最佳部分,并将其转化为一个很好的函数:
function mergeUnique(arr1, arr2){
return arr1.concat(arr2.filter(function (item) {
return arr1.indexOf(item) === -1;
}));
}
使用集合(ECMAScript 2015),将非常简单:
const array1=[“Vijendra”,“Singh”];const array2=[“Singh”,“Shakya”];console.log(Array.from(new Set(array1.concat(array2))));
我有一个类似的请求,但它具有数组中元素的Id。
这里是我进行重复数据消除的方法。
它简单,易于维护,使用方便。
// Vijendra's Id = Id_0
// Singh's Id = Id_1
// Shakya's Id = Id_2
let item0 = { 'Id': 'Id_0', 'value': 'Vijendra' };
let item1 = { 'Id': 'Id_1', 'value': 'Singh' };
let item2 = { 'Id': 'Id_2', 'value': 'Shakya' };
let array = [];
array = [ item0, item1, item1, item2 ];
let obj = {};
array.forEach(item => {
obj[item.Id] = item;
});
let deduplicatedArray = [];
let deduplicatedArrayOnlyValues = [];
for(let [index, item] of Object.values(obj).entries()){
deduplicatedArray = [ ...deduplicatedArray, item ];
deduplicatedArrayOnlyValues = [ ...deduplicatedArrayOnlyValues , item.value ];
};
console.log( JSON.stringify(array) );
console.log( JSON.stringify(deduplicatedArray) );
console.log( JSON.stringify(deduplicatedArrayOnlyValues ) );
控制台日志
[{"recordId":"Id_0","value":"Vijendra"},{"recordId":"Id_1","value":"Singh"},{"recordId":"Id_1","value":"Singh"},{"recordId":"Id_2","value":"Shakya"}]
[{"recordId":"Id_0","value":"Vijendra"},{"recordId":"Id_1","value":"Singh"},{"recordId":"Id_2","value":"Shakya"}]
["Vijendra","Singh","Shakya"]