control-flow-with-conditional-combinators

description: Use conditional combinators for control flow. globs: "**/*.ts" alwaysApply: true

Control Flow with Conditional Combinators

Rule: Use conditional combinators for control flow.

Example

import { Effect } from "effect";

const attemptAdminAction = (user: { isAdmin: boolean }) =>
  Effect.if(user.isAdmin, {
    onTrue: () => Effect.succeed("Admin action completed."),
    onFalse: () => Effect.fail("Permission denied."),
  });

const program = Effect.gen(function* () {
  // Try with admin user
  yield* Effect.logInfo("\nTrying with admin user...");
  const adminResult = yield* Effect.either(
    attemptAdminAction({ isAdmin: true })
  );
  yield* Effect.logInfo(
    `Admin result: ${adminResult._tag === "Right" ? adminResult.right : adminResult.left}`
  );

  // Try with non-admin user
  yield* Effect.logInfo("\nTrying with non-admin user...");
  const userResult = yield* Effect.either(
    attemptAdminAction({ isAdmin: false })
  );
  yield* Effect.logInfo(
    `User result: ${userResult._tag === "Right" ? userResult.right : userResult.left}`
  );
});

Effect.runPromise(program);

Explanation:
Effect.if and related combinators allow you to branch logic without leaving the Effect world or breaking the flow of composition.

Explanation:
These combinators allow you to embed conditional logic directly into your .pipe() compositions, maintaining a declarative style for simple branching.