Nice trick to sort tuples by selected fields

tuple_sort.swift

let foos: [(id: Int, bar: Int, baz: Int)] = [
  (100, 100, 100),
  (2, 100, 100),
  (3, 1000, 100),
  (1, 101, 100),
  (1, 100, 100),
]

// The comparison will first compare the .id fields and 
// only if they are equal will it perform the comparison on the .bar field
let sorted = foos.sorted(by: { lhs, rhs in
  (lhs.id, lhs.bar) < (rhs.id, rhs.bar)
})

print(sorted)