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Scala Programming · Module 9 of 10

Concurrency

Scala handles concurrent work with Futures and actors.

📖 Key ideas

  1. A Future runs work asynchronously and completes later with a value or failure.
  2. An ExecutionContext decides which threads run Futures.
  3. map and flatMap chain Futures without blocking.
  4. Await.result blocks and should be avoided in production code.
  5. Akka/Pekko actors process messages one at a time, avoiding shared-state locks.
💡 Real-life example: Like ordering food by token: you get a token (Future) now and collect the meal when it is ready, without standing at the counter.
FutureA value that arrives later
ExecutionContextThread pool that runs Futures
ActorObject that handles messages one by one
AwaitBlocks until a Future finishes