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

rmIndices.sort({ $1 < $0 })     

for index in rmIndices
{
    arr.removeAtIndex(index)
}

Note that I've sorted the indices in descending order. This is because everytime you remove an element E, the indices of the elements beyond E reduce by one.