How to check if Two Sets are Equal in JavaScript

How to check if Two Sets are Equal in JavaScript ?

Answer

In JavaScript, you can check if two sets are equal by comparing their size and elements using loops or the spread operator.

✐ Examples

1 Check Equality of Two Sets using Loops - Equal Sets

In this example,

We create two sets named set1 and set2.
We add the same elements to both sets.
We define a function named setsAreEqual to compare the sets.
Inside the function, we check if the sizes of both sets are equal.
We iterate over elements of set1 using the forEach method and check if each element is present in set2.
If all elements are found, we return true; otherwise, we return false.

JavaScript Program

let set1 = new Set([1, 2, 3]);
let set2 = new Set([1, 2, 3]);

function setsAreEqual(set1, set2) {
    if (set1.size !== set2.size) return false;
    let isEqual = true;
    set1.forEach(item => {
        if (!set2.has(item)) {
            isEqual = false;
        }
    });
    return isEqual;
}

console.log(setsAreEqual(set1, set2)); // Output: true

Output

true

2 Check Equality of Two Sets using Spread Operator - Non-Equal Sets

In this example,

We create two sets named set1 and set2.
We add different elements to both sets.
We use the spread operator ([...]) to convert sets to arrays and then compare the arrays for equality.

JavaScript Program

let set1 = new Set([1, 2, 3]);
let set2 = new Set([4, 5, 6]);

function setsAreEqual(set1, set2) {
    return JSON.stringify([...set1]) === JSON.stringify([...set2]);
}

console.log(setsAreEqual(set1, set2)); // Output: false

Output

false

Summary

In this tutorial, we learned How to check if Two Sets are Equal in JavaScript language with well detailed examples.

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How to check if Two Sets are Equal in JavaScript

How to check if Two Sets are Equal in JavaScript ?

Answer

✐ Examples

1 Check Equality of Two Sets using Loops - Equal Sets

JavaScript Program

Output

2 Check Equality of Two Sets using Spread Operator - Non-Equal Sets

JavaScript Program

Output

Summary

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