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

First try to find out the intersection of two arrays which is the base problem. Then try to build up for variable number of arrays passed as arguments for intersection. You can use reduce() for doing that.

function intersectionOfTwoArrays(arr1, arr2)
{
   return arr1.filter(x => arr2.some(y => y === x)); 
}


function intersection(...arrayOfArrays)
{
	return arrayOfArrays
	       .reduce((a, b) => intersectionOfTwoArrays(a, b));
}

intersection(
[5, 10, 15, 20], 
[15, 88, 1, 5, 7], 
[1, 10, 15, 5, 20]
);