How to remove IndexSetA from IndexSetB in Swift？

Question

In Objective-C, the NSIndexSet can removeIndexes:(NSIndexSet *)indexSet:

[aIndexSet removeIndexes: bIndexSet];

Is there some way to do this with IndexSet in Swift like the NSIndexSet in Objective-C?

Answer 1

There is a function, from the documentation

mutating func subtract(_ other: IndexSet)

Removes the elements of the given set from this set.

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var aIndexSet = IndexSet(integersIn: 0..<7)
let bIndexSet = IndexSet(integersIn: 4..<12)

aIndexSet.subtract(bIndexSet)

print(aIndexSet) // 0..<3