从两个数组中获取唯一值并将它们放在另一个数组中

Question

我在javascript中有两个数组 - :

var array1 = ['12','1','10','19','100'];
var array2 = ['12','10','19'];

我需要一个方法来从两个数组中获取唯一性并将它们放在array3中 Array3应该是 - :

var array3 = ['1','100'];

感谢帮助.

Answer 1

var array3 = array1.filter(function(obj) { return array2.indexOf(obj) == -1; });

阵列#过滤器上的MDN:https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/filter

包含旧版浏览器的polyfill.

Answer 2

有了一点ES6魔力,它可以相当简洁.请注意,我们需要检查两种方式,因为两个数组中都有唯一的项目.

const arr1 = [1, 2, 3, 4, 5];
const arr2 = [1, 3, 8];

let unique1 = arr1.filter((o) => arr2.indexOf(o) === -1);
let unique2 = arr2.filter((o) => arr1.indexOf(o) === -1);

const unique = unique1.concat(unique2);

console.log(unique);
// >> [2, 4, 5, 8]

Answer 3

var unique = [];
for(var i = 0; i < array1.length; i++){
    var found = false;

    for(var j = 0; j < array2.length; j++){ // j < is missed;
     if(array1[i] == array2[j]){
      found = true;
      break; 
    }
   }
   if(found == false){
   unique.push(array1[i]);
  }
}