Remove multiple indices from array

Question

I have an array and I want to remove a bunch of indices

var arr = [0,1,2,3,4,5,6]
var rmIndices = [1,4,5]

What is the best way to remove in

Answer 1

Rather than a list of indices to remove, it may be easier to have a list of indices to keep, which you can do using the Set type:

let rmIndices = [1,4,5]
let keepIndices = Set(arr.indices).subtract([1,4,5])

Then you can use PermutationGenerator to create a fresh array of just those indices:

arr = Array(PermutationGenerator(elements: arr, indices: keepIndices))