在typescript中的3个数组中查找公共元素[重复]

Question

arr1 = [10,20,30,40]    
arr2 = [20,30,50,60]   
arr3 = [70,40,30,20]

结果应为[20,30]

Answer 1

可以将reduce()与filter()和include()方法一起使用为

有关数组函数的更多信息请参阅

https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/array/reduce

var arr1 = [10,20,30,40];    
var arr2 = [20,30,50,60];  
var arr3 = [70,40,30,20];
var data = [arr1, arr2, arr3];
var result = data.reduce((a, b) => a.filter(c => b.includes(c)));

console.log(result);