add .tap to combining-effects

content/tutorials/basics/300-combining-effects.mdx

@@ -13,13 +13,23 @@ inside a `pipe` to run the first effect, and then run another effect if the
 first one succeeds. Here's an example:
 
 ```ts
-Effect.succeed(42).pipe(
-  Effect.andThen((value) => Effect.succeed(value * 2))
-)
+Effect.succeed(42).pipe(Effect.andThen((value) => Effect.succeed(value * 2)))
 ```
 
-The result of this effect will be the equivilent of `Effect.succeed(84)`.
+The result of this effect will be the equivilent of `Effect.succeed(42 * 2)`.
+
+### Effect.tap
+
+If you want to combine two effects together without altering the return value,
+you can use `Effect.tap`. Like `Effect.andThen`, it can be used in a pipeline.
+Here's an example:
+
+```ts
+Effect.succeed(42).pipe(Effect.tap((value) => Effect.log(value)))
+```
+
+The result of this effect will be `42`.
 
 ### Exercise
 
-Using `Effect.andThen`, complete the TODO in the editor.
+Using `Effect.andThen` & `Effect.tap`, complete the TODOs in the editor.

content/tutorials/basics/index.mdx

@@ -2,7 +2,6 @@
 title: Welcome
 excerpt: Learn the basics of Effect
 section: Learn the basics
-workspace: express
 ---
 
 Welcome to the Effect tutorials!
@@ -18,7 +17,6 @@ The benefits include:
 - Extensive library with a rich ecosystem of packages
 - Clustering and Workflows (Alpha)
 
-
 ### How to use this tutorial
 
 To the right is an editor & console window. As you make changes to the code in the editor, the program will re-run and show the output in the console.

src/tutorials/basics/300/main.initial.txt

@@ -1,6 +1,14 @@
 import { Effect } from "effect"
+import assert from "assert"
 
-Effect.succeed(42).pipe(
-  // TODO: log the value with `Effect.log`
+const multiplyByTwo = (value: number) => Effect.succeed(value * 2)
+
+const promise = Effect.succeed(42).pipe(
+  // TODO: multiply the value using `multiplyByTwo`
+  // TODO: log the value with `Effect.log`, without changing the return value
   Effect.runPromise
 )
+
+promise.then((finalValue) => {
+  assert.strictEqual(finalValue, 84)
+})

src/tutorials/basics/300/main.ts

@@ -1,6 +1,14 @@
 import { Effect } from "effect"
+import assert from "assert"
 
-Effect.succeed(42).pipe(
-  Effect.andThen((value) => Effect.log(value)),
+const multiplyByTwo = (value: number) => Effect.succeed(value * 2)
+
+const promise = Effect.succeed(42).pipe(
+  Effect.andThen(multiplyByTwo),
+  Effect.tap((value) => Effect.log(value)),
   Effect.runPromise
 )
+
+promise.then((finalValue) => {
+  assert.strictEqual(finalValue, 84)
+})