JavaScript. How to Compare Input Arrays

Question

I\'m stuck with this problem for 3 days now... Someone please help me.

Challenge 5
Construct a function intersection

Answer 1

You can go through the first array in the array of arrays and check which of its value is present in all the other arrays.

Here is an example:

function intersection(input) {
    let firstArray = input[0];
    let restOfArrays = input.splice(1);
    return firstArray.filter(v => restOfArrays.every(arr => arr.includes(v)));    
}

const input = [[5, 10, 15, 20], [15, 88, 1, 5, 7], [1, 10, 15, 5, 20]];
const result = intersection(input);

console.log(result);