模块化，通用

这可以通过组成两个基本功能来实现。

const getUniqueMerge = (...arrs) => getUniqueArr(mergeArrs(...arrs))
const getUniqueArr = (array) => Array.from(new Set(array))  
const mergeArrs = (...arrs) => [].concat(...arrs)

它可以处理无限的数组或值

console.log(getUniqueMerge(["Vijendra","Singh"],["Singh", "Shakya"])
// ["Vijendra", "Singh", "Shakya"]

console.log(getUniqueMerge(["Sheldon", "Cooper"], ["and", "Cooper", "Amy", "and"], "Farrah", "Amy", "Fowler"))
// ["Sheldon", "Cooper", "and", "Amy", "Farrah", "Fowler"]

Use:

Array.prototype.merge = function (arr) {
    var key;
    for(key in arr) 
        this[key] = arr[key];
};

我的一便士半：

Array.prototype.concat_n_dedupe = function(other_array) {
  return this
    .concat(other_array) // add second
    .reduce(function(uniques, item) { // dedupe all
      if (uniques.indexOf(item) == -1) {
        uniques.push(item);
      }
      return uniques;
    }, []);
};

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

var result = array1.concat_n_dedupe(array2);

console.log(result);

新解决方案（使用Array.prototype.indexOf和Array.prototype.cocat）：

Array.prototype.uniqueMerge = function( a ) {
    for ( var nonDuplicates = [], i = 0, l = a.length; i<l; ++i ) {
        if ( this.indexOf( a[i] ) === -1 ) {
            nonDuplicates.push( a[i] );
        }
    }
    return this.concat( nonDuplicates )
};

用法：

>>> ['Vijendra', 'Singh'].uniqueMerge(['Singh', 'Shakya'])
["Vijendra", "Singh", "Shakya"]

Array.prototype.indexOf（用于internet explorer）：

Array.prototype.indexOf = Array.prototype.indexOf || function(elt)
  {
    var len = this.length >>> 0;

    var from = Number(arguments[1]) || 0;
    from = (from < 0) ? Math.ceil(from): Math.floor(from); 
    if (from < 0)from += len;

    for (; from < len; from++)
    {
      if (from in this && this[from] === elt)return from;
    }
    return -1;
  };

Array.prototype.pushUnique = function(values)
{
    for (var i=0; i < values.length; i++)
        if (this.indexOf(values[i]) == -1)
            this.push(values[i]);
};

Try:

var array1 = ["Vijendra","Singh"];
var array2 = ["Singh", "Shakya"];
array1.pushUnique(array2);
alert(array1.toString());  // Output: Vijendra,Singh,Shakya

下面是一个简单的例子：

var unique = function(array) {
    var unique = []
    for (var i = 0; i < array.length; i += 1) {
        if (unique.indexOf(array[i]) == -1) {
            unique.push(array[i])
        }
    }
    return unique
}

var uniqueList = unique(["AAPL", "MSFT"].concat(["MSFT", "BBEP", "GE"]));

我们定义unique（array）来删除冗余元素，并使用concat函数来组合两个数组。