Set extended

The SetExt class extends the built-in Set class by adding some additional methods for working with sets.

• addRange(list): Adds elements from the passed list to the Set.
• union(list): Returns a new Set representing the union of the current Set and the given list.
• intersection(list): Returns a new Set containing the intersection of the current Set and the passed list.
• difference(list): Returns a new Set containing the difference between the current Set and the given list.
• symmetricDifference(list): Returns a new Set representing the symmetric difference between the current Set and the given list.
• isSuperset(subset): Checks whether the current Set is a superset of the given subset.
• isSubset(superset): Checks whether the current Set is a subset of the passed superset.
• toString(separator): Returns a string representation of a Set, concatenating elements through the specified separator.
• toArray(): Converts a Set to an array.
• toStruct({ base, step }): Transforming the Set according to your structure. base - initial view of the desired structure, step - function-instruction for forming your data structure. Takes four parameters:
  1. structure in the state of the previous step
  2. current element of the Set
  3. current element index
  4. Set size

step must return the updated structure. Example:

SetExt([1, 2, 3]).toStruct({
  base: {},
  step: (struct, elem) => {
    struct[elem] = elem;
    return struct;
  }
}); // { 1: 1, 2: 2, 3: 3 }