Patterns and Match

• patterns

• refutable vs irrefutable

• match

• Sequence type

• ... except for dynamic index signatures where it types as V | undefined (via dynamic.find)

• ranges: ..

• switch still works but match encouraged

• let, let-else

• if let

• while let

• match guards

• No Computed Keys

• no obj[expr] where expr is dynamic

• destructure dynamically with { [key]: value }?

1enum State { Pending, Running, Complete }2declare const state: State;3 4const label = match (state) {5    State.Pending => "pending",6    State.Running => "running",7    State.Complete => "complete",8};