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How to use array push() to insert unique items with JavaScript?

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Sometimes, we want to use array push() to insert unique items with JavaScript.

In this article, we’ll look at how to use array push() to insert unique items with JavaScript.

How to use array push() to insert unique items with JavaScript?

To use array push() to insert unique items with JavaScript, we can use a set.

For instance, we write

const items = new Set();
items.add(item);
console.log([...items]);

to create a new set with the Set constructor.

Then we call add to add a new item to the set.

Sets can’t have duplicate items, so only the last one with the same value is kept.

And then we can use the spread operator to convert items back to an array.

Conclusion

To use array push() to insert unique items with JavaScript, we can use a set.

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