
Essential JavaScript Set Methods You Should Know
The release of Firefox 127 introduces new JavaScript Set methods, including intersection(), union(), difference(), symmetricDifference(), isSubsetOf(), isSupersetOf(), and isDisjointFrom() now supported across major browser engines. Polyfills are no longer needed to make them work everywhere. These additions provide convenient, built-in ways to manipulate and compare collections aiming to simplify development and enhance performance.
JavaScript Sets function similarly to Arrays but guarantee the uniqueness of each value. This automatic removal of duplicates makes Sets perfect for creating unique collections. For instance, here’s a simple example of creating and adding elements to a Set:
Sets are also typically faster for checking if an element exists compared to Arrays, making them useful for performance-sensitive applications.
The union() method returns a new Set containing elements from both the original Set and the given Set. This is useful for combining collections without duplicates:
The “intersection()” method returns a new Set containing only elements present in both Sets. This is helpful for finding common elements:
The “symmetricDifference()” method returns a new Set containing elements present in either of the Sets but not in both. This is useful for finding unique elements between two Sets:
The “difference()” method returns a new Set containing elements present in the original Set but not in the given Set. This is useful for subtracting elements:
The methods “isSubsetOf()” and “isSupersetOf()” return Boolean values based on the relationship between Sets. The “isSubsetOf()” method checks if all elements of a Set are in another Set, while the “isSupersetOf()” method determines if a Set contains all elements of another Set.
The isDisjointFrom() method checks if two Sets have no common elements:
The community has responded positively to these new methods. In Reddit thread user peterlinddk said:
Another user, Pelopida92, praised the performance benefits, stating:
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