Pattern Matching

ELI5 — The Vibe Check

Pattern matching is like a super-powered switch statement that can look inside data structures and pull out the parts you need. Instead of checking 'is this a number?' you can say 'is this a list with exactly 3 items where the first is a string?'

Real Talk

A language feature that allows deconstructing data against patterns, binding variables, and branching based on structure. Pattern matching combines conditional logic, destructuring, and type checking into a single expressive construct. Available in Rust, Elixir, Haskell, Scala, and increasingly in TypeScript (via discriminated unions) and Python (match/case).

Show Me The Code

# Python 3.10+
match command:
    case {"action": "move", "direction": d}:
        print(f"Moving {d}")
    case {"action": "attack", "target": t}:
        print(f"Attacking {t}")
    case _:
        print("Unknown command")

When You'll Hear This

"Rust's pattern matching with exhaustiveness checking catches so many bugs at compile time." / "Python 3.10's match/case finally brought structural pattern matching to the language."