From 28e7dfee44e3ac8929a8e0a01661ebbc32672849 Mon Sep 17 00:00:00 2001
From: deepshekhardas <deepshekharadas1234@gmail.com>
Date: Wed, 15 Jul 2026 15:28:21 +0530
Subject: [PATCH 1/2] Fix zipper instructions to accurately describe zipper
 data structure

Updated the instructions to clarify that a zipper consists of:
1. The path/thread leading to the focused node
2. The focused subtree

This resolves the misleading description that a zipper 'contains
a data structure and a pointer into that data structure.'

Fixes exercism/javascript#777
---
 exercises/practice/zipper/.docs/instructions.md | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/exercises/practice/zipper/.docs/instructions.md b/exercises/practice/zipper/.docs/instructions.md
index 5445db0035..fd401c27e1 100644
--- a/exercises/practice/zipper/.docs/instructions.md
+++ b/exercises/practice/zipper/.docs/instructions.md
@@ -2,10 +2,15 @@
 
 Creating a zipper for a binary tree.
 
-[Zippers][zipper] are a purely functional way of navigating within a data structure and manipulating it.
-They essentially contain a data structure and a pointer into that data structure (called the focus).
+[Zippers][zipper] are a purely functional way to navigate and manipulate a data structure.
+A zipper is not simply a data structure with a pointer - instead, it consists of two parts:
 
-For example given a rose tree (where each node contains a value and a list of child nodes) a zipper might support these operations:
+1. **The path/thread**: The steps taken to reach the focused node (e.g., "go left from root", "go right from there")
+2. **The focused subtree**: The current node and everything below it
+
+From these two parts, the original data structure can be fully reconstructed, and modifications can be made by building new subtrees as you reverse the path.
+
+For example given a binary tree, a zipper might support these operations:
 
 - `from_tree` (get a zipper out of a rose tree, the focus is on the root node)
 - `to_tree` (get the rose tree out of the zipper)

From 1caeaa9aa2b75d592d34b212f6cd279b9ee1ee56 Mon Sep 17 00:00:00 2001
From: deepshekhardas <deepshekharadas1234@gmail.com>
Date: Wed, 15 Jul 2026 16:53:51 +0530
Subject: [PATCH 2/2] Add prerequisites for exercises in issue #987

Added prerequisites for:
- roman-numerals: strings, loops, numbers, conditionals
- square-root: numbers, arithmetic-operators
- all-your-base: numbers, arrays, loops, arithmetic-operators
- queen-attack: classes, numbers, conditionals
- react: classes, numbers, arrays, functions
- zipper: classes, recursion, trees, numbers, arrays
---
 config.json | 40 ++++++++++++++++++++++++++++++++++------
 1 file changed, 34 insertions(+), 6 deletions(-)

diff --git a/config.json b/config.json
index 6fcb8932ad..1b61535974 100644
--- a/config.json
+++ b/config.json
@@ -2325,7 +2325,12 @@
         "name": "Roman Numerals",
         "uuid": "2fc4f834-a51c-42b8-a4d9-5263229e7648",
         "practices": [],
-        "prerequisites": [],
+        "prerequisites": [
+          "strings",
+          "loops",
+          "numbers",
+          "conditionals"
+        ],
         "difficulty": 3,
         "topics": [
           "conditionals",
@@ -2391,7 +2396,10 @@
         "name": "Square Root",
         "uuid": "31c7725e-def0-4dc9-88a0-e19afb9bfb06",
         "practices": [],
-        "prerequisites": [],
+        "prerequisites": [
+          "numbers",
+          "arithmetic-operators"
+        ],
         "difficulty": 4,
         "topics": [
           "bitwise_operations",
@@ -2422,7 +2430,12 @@
         "name": "All Your Base",
         "uuid": "d2d3cd13-b06c-4c24-9964-fb1554f70dd4",
         "practices": [],
-        "prerequisites": [],
+        "prerequisites": [
+          "numbers",
+          "arrays",
+          "loops",
+          "arithmetic-operators"
+        ],
         "difficulty": 5,
         "topics": [
           "conditionals",
@@ -2465,7 +2478,11 @@
         "name": "Queen Attack",
         "uuid": "007a4cd4-7324-4512-8905-ead0c78146f7",
         "practices": [],
-        "prerequisites": [],
+        "prerequisites": [
+          "classes",
+          "numbers",
+          "conditionals"
+        ],
         "difficulty": 4,
         "topics": [
           "conditionals",
@@ -2482,7 +2499,12 @@
         "name": "React",
         "uuid": "303c6969-9446-41aa-871a-11223a43e810",
         "practices": [],
-        "prerequisites": [],
+        "prerequisites": [
+          "classes",
+          "numbers",
+          "arrays",
+          "functions"
+        ],
         "difficulty": 8,
         "topics": [
           "algorithms",
@@ -2495,7 +2517,13 @@
         "name": "Zipper",
         "uuid": "fd1575f3-3087-4cfa-8a26-168fba6d0606",
         "practices": [],
-        "prerequisites": [],
+        "prerequisites": [
+          "classes",
+          "recursion",
+          "trees",
+          "numbers",
+          "arrays"
+        ],
         "difficulty": 8,
         "topics": [
           "recursion",