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

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]

其他回答

为此……这里有一个单行解决方案:

const x = [...new Set([['C', 'B'],['B', 'A']].reduce( (a, e) => a.concat(e), []))].sort()
// ['A', 'B', 'C']

不是特别可读,但它可能会帮助某人:

将初始累加器值设置为空数组的reduce函数应用于空数组。reduce函数使用concat将每个子数组附加到累加器数组上。其结果作为构造函数参数传递,以创建新的Set。排列运算符用于将集合转换为数组。sort()函数应用于新数组。

Array.prototype.add = function(b){
    var a = this.concat();                // clone current object
    if(!b.push || !b.length) return a;    // if b is not an array, or empty, then return a unchanged
    if(!a.length) return b.concat();      // if original is empty, return b

    // go through all the elements of b
    for(var i = 0; i < b.length; i++){
        // if b's value is not in a, then add it
        if(a.indexOf(b[i]) == -1) a.push(b[i]);
    }
    return a;
}

// Example:
console.log([1,2,3].add([3, 4, 5])); // will output [1, 2, 3, 4, 5]

之前写过同样的原因(适用于任意数量的数组):

/**
 * Returns with the union of the given arrays.
 *
 * @param Any amount of arrays to be united.
 * @returns {array} The union array.
 */
function uniteArrays()
{
    var union = [];
    for (var argumentIndex = 0; argumentIndex < arguments.length; argumentIndex++)
    {
        eachArgument = arguments[argumentIndex];
        if (typeof eachArgument !== 'array')
        {
            eachArray = eachArgument;
            for (var index = 0; index < eachArray.length; index++)
            {
                eachValue = eachArray[index];
                if (arrayHasValue(union, eachValue) == false)
                union.push(eachValue);
            }
        }
    }

    return union;
}    

function arrayHasValue(array, value)
{ return array.indexOf(value) != -1; }

const merge(…args)=>(新集合([].contat(…arg)))

var MergeArrays=function(arrayOne, arrayTwo, equalityField) {
    var mergeDictionary = {};

    for (var i = 0; i < arrayOne.length; i++) {
        mergeDictionary[arrayOne[i][equalityField]] = arrayOne[i];
    }

    for (var i = 0; i < arrayTwo.length; i++) {
        mergeDictionary[arrayTwo[i][equalityField]] = arrayTwo[i];
    }

    return $.map(mergeDictionary, function (value, key) { return value });
}

利用字典和Jquery,您可以合并这两个数组,而不会得到重复项。在我的示例中,我在对象上使用给定的字段,但可能只是对象本身。