How to check if a Set is Empty in JavaScript

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How to check if a Set is Empty in JavaScript ?

Answer

To check if a Set is empty in JavaScript, you can use the size property of the Set object.

✐ Examples

1 Check if Set is Empty

In this example,

We declare a Set named set and initialize it with some elements, or an empty Set if there are no elements.
We use the size property of the Set set to determine the number of elements it contains.
If the size of the Set is 0, it means the Set is empty; otherwise, it has elements.
We print the result to the standard output to indicate whether the Set is empty or not.

JavaScript Program

let set = new Set(); // Or new Set(['a', 'b', 'c']) for a non-empty Set
let isEmpty = set.size === 0;
if (isEmpty) {
    console.log('The Set is empty');
} else {
    console.log('The Set is not empty');
}

Output

The Set is empty

2 Check if Empty Set is Empty

In this example,

We declare an empty Set named emptySet.
We use the size property of the Set emptySet to determine the number of elements it contains.
Since the size of the Set is 0, it means the Set is empty.
We print the result to the standard output to indicate that the Set is indeed empty.

JavaScript Program

let emptySet = new Set();
let isEmpty = emptySet.size === 0;
if (isEmpty) {
    console.log('The Set is empty');
} else {
    console.log('The Set is not empty');
}

Output

The Set is empty

Summary

In this tutorial, we learned How to check if a Set is Empty in JavaScript language with well detailed examples.

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How to check if a Set is Empty in JavaScript

How to check if a Set is Empty in JavaScript ?

Answer

✐ Examples

1 Check if Set is Empty

JavaScript Program

Output

2 Check if Empty Set is Empty

JavaScript Program

Output

Summary

More JavaScript Sets Tutorials