Filtering and unwrapping optionals in a sequence with `for case let` #tip #swift-api

ForCaseLetOptionalFiltering.swift

// Demonstrates filtering and unwrapping optionals in a sequence with `for case let`.
// Equivalent to `compactMap`, but shows pattern matching directly in the loop.

let strings: [String?] = ["pizza", nil, "cola"]

for case let string? in strings {
  print(string) // pizza, cola
}