找到重複的兩個數組

Question

我有兩個數組是這樣的：

var x = ['1','2','6']; 
var y = ['4', '5','6']; 

如何找到在純JavaScript和我在兩個數組複製想避免使用循環？

輸出 - duplicates: 6

Answer 1

嘗試這樣：

var x = ['1','2','6']; 
var y = ['4', '5','6']; 

var overlap = x.filter(function(v,i,a){ 
    return y.indexOf(v) > -1; 
}); 

console.log(overlap); // ['6'] 

這是否工作，爲你的目的是什麼？

MDN docs for filter

Answer 2

試試這個

var x = ['1','2','6']; 
var y = ['4', '5','6']; 
var duplicate = []; 
for (var i=0; i<y.length; i++) { 
    var index = x.indexOf(y[i]); 
    if (index > -1) { 
     duplicate.push(x[index]); 
    } 
} 

Output: ["6"]