Skript not working arr.filter() in google apps-CodePudding

This is my script

    var arr1 = [[1],[2],[3],[4]],
        arr2 = [[2],[4]],
        res = arr1.filter( item => arr2.includes( item[0] ) );
    Logger.log(res);

And it doesn't work. What's wrong here?

CodePudding user response：

Instead of using includes, you can use find, because you have arrays inside arrays.

var arr1 = [[1], [2], [3], [4]],
  arr2 = [[2], [4]],
  res = arr1.filter((item) => arr2.find((el) => el[0] === item[0]));
console.log(res);

CodePudding user response：

If you sure that the all sub arrays of arr2 contain just one element always, you can fix your code if you just add .flat() method in the second line:

var arr1 = [[1],[2],[3],[4]],
    arr2 = [[2],[4]].flat(), // <-------------------------- here
    res = arr1.filter(item => arr2.includes(item[0]));

console.log(res);