Welcome to JavaScript Sets! A Set is a built-in object that stores unique values of any type. The key feature of Sets is that they automatically prevent duplicate values. When you create a Set from an array with duplicates, only unique values are kept.
Sets can be created in multiple ways. You can create an empty Set using the new Set constructor. You can also create a Set from an array, which automatically removes duplicates. When creating from a string, each character becomes a unique element. Sets can store mixed data types including numbers, strings, and booleans.
Sets provide several useful methods. The add method adds new values but ignores duplicates. The delete method removes specific values. The has method checks if a value exists. You can get the size using the size property. The clear method removes all values, and forEach allows you to iterate through all values in the Set.
Sets and arrays serve different purposes. Sets excel at preventing duplicates and fast lookups, making them perfect for unique collections. Arrays are better for ordered data with index access and have more built-in methods. Common Set use cases include removing duplicates from arrays, checking for common elements between collections, and finding unique characters in strings.
Sets can be created in multiple ways. You can create an empty Set using the new Set constructor. You can also create a Set from an array, which automatically removes duplicates. When creating from a string, each character becomes a unique element. Sets can store mixed data types including numbers, strings, and booleans.
Sets provide several useful methods. The add method adds new values but ignores duplicates. The delete method removes specific values. The has method checks if a value exists. You can get the size using the size property. The clear method removes all values, and forEach allows you to iterate through all values in the Set.
Sets and arrays serve different purposes. Sets excel at preventing duplicates and fast lookups, making them perfect for unique collections. Arrays are better for ordered data with index access and have more built-in methods. Common Set use cases include removing duplicates from arrays, checking for common elements between collections, and finding unique characters in strings.
Sets offer multiple iteration methods including for-of loops, forEach, and spread syntax to convert to arrays. You can also perform set operations like union and intersection. Sets are perfect when you need unique values and fast lookups. Remember to use Sets for duplicate removal, membership testing, and when working with unique collections in your JavaScript applications.