Superset of Iterable

Introduction

In this lab, we will explore how to use the Set constructor and Array.prototype.every() method to determine if one iterable is a superset of another. The lab will walk you through the creation of a function that checks if the first iterable contains all the elements of the second iterable, excluding any duplicates. By the end of the lab, you will have a better understanding of how to work with sets in JavaScript.

Function to Check if One Set is a Superset of Another Set

To check if one set is a superset of another set, use the superSet() function. First, open the Terminal/SSH and type node to start practicing coding. Then, use the following steps:

• Create a new Set object from each iterable using the Set constructor.
• Use Array.prototype.every() and Set.prototype.has() to check that each value in the second iterable is contained in the first one.
• The function returns true if the first iterable is a superset of the second one, excluding duplicate values. Otherwise, it returns false.

const superSet = (a, b) => {
  const sA = new Set(a),
    sB = new Set(b);
  return [...sB].every((v) => sA.has(v));
};

Use superSet() with two sets as arguments to check if one set is a superset of another set.

superSet(new Set([1, 2, 3, 4]), new Set([1, 2])); // true
superSet(new Set([1, 2, 3, 4]), new Set([1, 5])); // false

Summary

Congratulations! You have completed the Superset of Iterable lab. You can practice more labs in LabEx to improve your skills.