From c2ff82ed9a42ed907fe02120bce166f422b34556 Mon Sep 17 00:00:00 2001
From: Ilenia <26656284+ilenia-magoni@users.noreply.github.com>
Date: Fri, 5 Sep 2025 20:56:01 +0200
Subject: [PATCH] feat: add falsy bouncer to full stack (#61688)

---
 client/i18n/locales/english/intro.json        |  6 ++
 .../lab-falsy-remover/index.md                |  9 ++
 .../adf08ec01beb4f99fc7a68f2.md               | 84 +++++++++++++++++++
 .../structure/blocks/lab-falsy-remover.json   | 12 +++
 .../superblocks/full-stack-developer.json     |  1 +
 5 files changed, 112 insertions(+)
 create mode 100644 client/src/pages/learn/full-stack-developer/lab-falsy-remover/index.md
 create mode 100644 curriculum/challenges/english/blocks/lab-falsy-remover/adf08ec01beb4f99fc7a68f2.md
 create mode 100644 curriculum/structure/blocks/lab-falsy-remover.json

diff --git a/client/i18n/locales/english/intro.json b/client/i18n/locales/english/intro.json
index f84b1e8a1e2..d1558edc8fb 100644
--- a/client/i18n/locales/english/intro.json
+++ b/client/i18n/locales/english/intro.json
@@ -3406,6 +3406,12 @@
           "In these lectures, you will learn about the <code>var</code> keyword and why it is not recommended for use anymore. You will also learn about hoisting in JavaScript so you can avoid subtle bugs in your code."
         ]
       },
+      "lab-falsy-remover": {
+        "title": "Implement a Falsy Remover",
+        "intro": [
+          "In this lab, you will create a function that removes all falsy values from an array."
+        ]
+      },
       "lab-inventory-management-program": {
         "title": "Build an Inventory Management Program",
         "intro": [
diff --git a/client/src/pages/learn/full-stack-developer/lab-falsy-remover/index.md b/client/src/pages/learn/full-stack-developer/lab-falsy-remover/index.md
new file mode 100644
index 00000000000..323b8f39005
--- /dev/null
+++ b/client/src/pages/learn/full-stack-developer/lab-falsy-remover/index.md
@@ -0,0 +1,9 @@
+---
+title: Introduction to Implement a Falsy Remover
+block: lab-falsy-remover
+superBlock: full-stack-developer
+---
+
+## Introduction to Implement a Falsy Remover
+
+In this lab, you will create a function that removes all falsy values from an array.
diff --git a/curriculum/challenges/english/blocks/lab-falsy-remover/adf08ec01beb4f99fc7a68f2.md b/curriculum/challenges/english/blocks/lab-falsy-remover/adf08ec01beb4f99fc7a68f2.md
new file mode 100644
index 00000000000..8dbf42daf6f
--- /dev/null
+++ b/curriculum/challenges/english/blocks/lab-falsy-remover/adf08ec01beb4f99fc7a68f2.md
@@ -0,0 +1,84 @@
+---
+id: adf08ec01beb4f99fc7a68f2
+title: Implement a Falsy Remover
+challengeType: 26
+dashedName: implement-a-falsy-remover
+---
+
+# --description--
+
+In this lab you will create a function that removes all falsy values from an array.
+
+Falsy values in JavaScript are `false`, `null`, `0`, `""`, `undefined`, and `NaN`.
+
+**Objective**: Fulfill the user stories below and get all the tests to pass to complete the lab.
+
+**User Stories:**
+
+1. You should have a `bouncer` function that takes an array as argument.
+1. The `bouncer` function should return a new array that contains the same elements as the array passed in as argument with the falsy elements removed.
+1. The `bouncer` function should not change the array passed in as an argument.
+
+Hint: Try converting each value to a Boolean.
+
+# --hints--
+
+You should have a `bouncer` function.
+
+```js
+assert.isFunction(bouncer);
+```
+
+`bouncer([7, "ate", "", false, 9])` should return `[7, "ate", 9]`.
+
+```js
+assert.deepEqual(bouncer([7, 'ate', '', false, 9]), [7, 'ate', 9]);
+```
+
+`bouncer(["a", "b", "c"])` should return `["a", "b", "c"]`.
+
+```js
+assert.deepEqual(bouncer(['a', 'b', 'c']), ['a', 'b', 'c']);
+```
+
+`bouncer([false, null, 0, NaN, undefined, ""])` should return `[]`.
+
+```js
+assert.deepEqual(bouncer([false, null, 0, NaN, undefined, '']), []);
+```
+
+`bouncer([null, NaN, 1, 2, undefined])` should return `[1, 2]`.
+
+```js
+assert.deepEqual(bouncer([null, NaN, 1, 2, undefined]), [1, 2]);
+```
+
+The `bouncer` function should not mutate the array passed in as argument.
+
+```js
+const arr = ['a', false, 0, 'Naomi'];
+bouncer(arr);
+assert.deepEqual(arr, ['a', false, 0, 'Naomi']);
+```
+
+`bouncer([])` should return `[]`.  
+
+```js  
+assert.deepEqual(bouncer([]), []);  
+```  
+
+# --seed--
+
+## --seed-contents--
+
+```js
+
+```
+
+# --solutions--
+
+```js
+function bouncer(arr) {
+  return arr.filter(e => e);
+}
+```
diff --git a/curriculum/structure/blocks/lab-falsy-remover.json b/curriculum/structure/blocks/lab-falsy-remover.json
new file mode 100644
index 00000000000..a498ab2a94d
--- /dev/null
+++ b/curriculum/structure/blocks/lab-falsy-remover.json
@@ -0,0 +1,12 @@
+{
+  "name": "Implement a Falsy Remover",
+  "isUpcomingChange": false,
+  "dashedName": "lab-falsy-remover",
+  "helpCategory": "JavaScript",
+  "challengeOrder": [
+    { "id": "adf08ec01beb4f99fc7a68f2", "title": "Implement a Falsy Remover" }
+  ],
+  "usesMultifileEditor": true,
+  "blockType": "lab",
+  "blockLayout": "link"
+}
diff --git a/curriculum/structure/superblocks/full-stack-developer.json b/curriculum/structure/superblocks/full-stack-developer.json
index 0abe2db2b6d..9d4072d0771 100644
--- a/curriculum/structure/superblocks/full-stack-developer.json
+++ b/curriculum/structure/superblocks/full-stack-developer.json
@@ -377,6 +377,7 @@
             "lab-pyramid-generator",
             "lab-gradebook-app",
             "lecture-the-var-keyword-and-hoisting",
+            "lab-falsy-remover",
             "lab-inventory-management-program",
             "lecture-understanding-modules-imports-and-exports",
             "lab-password-generator",