Check if Two Arrays Intersect

Introduction

In this lab, we will be exploring an algorithm that determines whether two arrays have a common item or not. We will be using JavaScript and its built-in data structures to create a function that will take two arrays as input and return a boolean value indicating whether they intersect or not. This lab will help you improve your problem-solving skills and enhance your understanding of data structures and algorithms.

Skills Graph

How to Check if Two Arrays Have a Common Item

To check if two arrays have a common item, follow these steps:

1. Open the Terminal/SSH and type node to start practicing coding.
2. Create a Set from b to get the unique values in b.
3. Use Array.prototype.some() on a to check if any of its values are contained in b, using Set.prototype.has().
4. Use the intersects function provided below to test the arrays.

const intersects = (a, b) => {
  const s = new Set(b);
  return [...new Set(a)].some((x) => s.has(x));
};

Use the intersects function to check if two arrays intersect:

intersects(["a", "b"], ["b", "c"]); // true
intersects(["a", "b"], ["c", "d"]); // false

By following these steps and using the provided code, you can easily check if two arrays have a common item.

Summary

Congratulations! You have completed the Check if Two Arrays Intersect lab. You can practice more labs in LabEx to improve your skills.