Why it matters

ZIO is Scala's most popular effect library. Understanding shapes modern app design.

Advertisement

The architecture

ZIO[R, E, A]: effect requiring env R, may fail with E, produces A.

Combinators for combining, retrying, timeout, parallelism.

ZIO typeRenvironmentEerror typeAsuccess valueType-safe environment (R) enables dependency injection at type level
ZIO signature.
Advertisement

How it works end to end

Combinators: map, flatMap, zip, race, fork, retry.

Env: provide dependencies via type. Similar to Reader monad.

Error handling: typed errors; catchAll for recovery.

ZIO Streams: streaming with same effect ergonomics.