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Sep 10, 2025
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Added JavaScript and mongosh tabs to challenge solutions #23

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79 changes: 64 additions & 15 deletions docs/40-CRUD/1-WHERE.mdx
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@@ -1,3 +1,6 @@
import Tabs from "@theme/Tabs";
import TabItem from "@theme/TabItem";

# 👐 WHERE → .find()

Similar to SQL's `WHERE` clause, the `.find()` method in MongoDB retrieves documents from a collection that matches a specified query.
Expand Down Expand Up @@ -91,31 +94,77 @@ Now, translate the following into a MongoDB query.

<details>
<summary>Answer</summary>
<div>
```js
db.books.find({ totalInventory: 5 });
```
</div>
<Tabs groupId="challenges" defaultValue={"javascript"}>
<TabItem value="javascript" label="JavaScript">
<div>
```js
const cursor = await books.find({ totalInventory: 5 });

await cursor.forEach((b) => {
console.log(b);
});
```
</div>
</TabItem>
<TabItem value="mongosh" label="mongosh">
<div>
```js
db.books.find({ totalInventory: 5 });
```
</div>
</TabItem>
</Tabs>

</details>

#### 2. Find all books with more than 300 pages.

<details>
<summary>Answer</summary>
<div>
```js
db.books.find({ pages: {$gt: 300} });
```
</div>
<Tabs groupId="challenges" defaultValue={"javascript"}>
<TabItem value="javascript" label="JavaScript">
<div>
```js
const cursor = await books.find({ pages: {$gt: 300} });

await cursor.forEach((b) => {
console.log(b);
});
```
</div>
</TabItem>
<TabItem value="mongosh" label="mongosh">
<div>
```js
db.books.find({ pages: {$gt: 300} });
```
</div>
</TabItem>
</Tabs>
</details>

#### 3. Find books in the `Science` genre that are more than 300 pages long.

<details>
<summary>Answer</summary>
<div>
```js
db.books.find({ "genre.name": "Science", pages: {$gt: 300} });
```
</div>
<Tabs groupId="challenges" defaultValue={"javascript"}>
<TabItem value="javascript" label="JavaScript">
<div>
```js
const cursor = await books.find( { "genre.name": "Science", pages: {$gt: 300} } );

await cursor.forEach((b) => {
console.log(b);
});
```
</div>
</TabItem>
<TabItem value="mongosh" label="mongosh">
<div>
```js
db.books.find({ "genre.name": "Science", pages: {$gt: 300} });
```
</div>
</TabItem>
</Tabs>
</details>
54 changes: 44 additions & 10 deletions docs/40-CRUD/2-SELECT.mdx
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import Tabs from "@theme/Tabs";
import TabItem from "@theme/TabItem";

# 👐 SELECT → projection

In SQL, the `SELECT` statement allows us to specify which columns to retrieve from a table. Similarly, in MongoDB, we use **projection** in the `.find()` method to control which fields to include (or exclude) in query results.
Expand Down Expand Up @@ -77,20 +80,51 @@ Here:

<details>
<summary>Answer</summary>
<div>
```js
db.books.find({}, {title: 1, _id: 0});
```
</div>
<Tabs groupId="challenges" defaultValue={"javascript"}>
<TabItem value="javascript" label="JavaScript">
<div>
```js
const cursor = await books.find({}).project( {title: 1, _id: 0} ).limit(10);

await cursor.forEach((b) => {
console.log(b);
});
```
</div>

</TabItem>
<TabItem value="mongosh" label="mongosh">
<div>
```js
db.books.find({}, {title: 1, _id: 0});
```
</div>
</TabItem>
</Tabs>
</details>

### 👐 2. Retrieve all fields except `_id` and `authors` for books in the "History" genre.

<details>
<summary>Answer</summary>
<div>
```js
db.books.find({ "genre.name": "History" }, { _id: 0, authors: 0 });
```
</div>
<Tabs groupId="challenges" defaultValue={"javascript"}>
<TabItem value="javascript" label="JavaScript">
<div>
```js
const cursor = await books.find({ "genre.name": "History" }).project( { _id: 0, authors: 0 } ).limit(10);

await cursor.forEach((b) => {
console.log(b);
});
```
</div>
</TabItem>
<TabItem value="mongosh" label="mongosh">
<div>
```js
db.books.find({ "genre.name": "History" }, { _id: 0, authors: 0 });
```
</div>
</TabItem>
</Tabs>
</details>
28 changes: 23 additions & 5 deletions docs/40-CRUD/3-ORDER-LIMIT.mdx
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@@ -1,3 +1,6 @@
import Tabs from "@theme/Tabs";
import TabItem from "@theme/TabItem";

# 👐 ORDER BY → .sort() & LIMIT → .limit()

In SQL, we use `ORDER BY` to sort query results and `LIMIT` to restrict the number of returned rows. MongoDB provides the `.sort()` and `.limit()` methods to achieve the same.
Expand Down Expand Up @@ -64,9 +67,24 @@ This returns the **top 10 available books** in the "Science Fiction" genre.

<details>
<summary>Answer</summary>
<div>
```js
db.books.find({}).sort({title: 1}).limit(10)
```
</div>
<Tabs groupId="challenges" defaultValue={"javascript"}>
<TabItem value="javascript" label="JavaScript">
<div>
```js
const cursor = await books.find({}).sort({title: 1}).limit(10);

await cursor.forEach((b) => {
console.log(b);
});
```
</div>
</TabItem>
<TabItem value="mongosh" label="mongosh">
<div>
```js
db.books.find({}).sort({title: 1}).limit(10)
```
</div>
</TabItem>
</Tabs>
</details>
122 changes: 87 additions & 35 deletions docs/40-CRUD/4-INSERT-DELETE.mdx
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import Tabs from "@theme/Tabs";
import TabItem from "@theme/TabItem";

# 👐 INSERT → insertOne() & DELETE → deleteOne()

MongoDB provides two methods for inserting documents into a collection:
Expand Down Expand Up @@ -67,45 +70,94 @@ DELETE FROM reviews WHERE bookId = '0786222727';

<details>
<summary>Answer</summary>
<div>
```js
db.reviews.insertMany([
{
text: "Thrilling end.",
rating: 4,
name: "Mark",
bookId: "0786222727",
},
{
text: "Must read!",
rating: 5,
name: "Raj",
bookId: "0786222727",
},
{
text: "Very expensive",
rating: 3,
name: "Yun",
bookId: "0786222727",
},
{
text: "Extremely satisfied with the storyline!",
rating: 5,
name: "Lisa",
bookId: "0786222727",
}
]);
```
</div>
<Tabs groupId="challenges" defaultValue={"javascript"}>
<TabItem value="javascript" label="JavaScript">
<div>
```js
const reviews = db.collection("reviews");
await reviews.insertMany([
{
text: "Thrilling end.",
rating: 4,
name: "Mark",
bookId: "0786222727",
},
{
text: "Must read!",
rating: 5,
name: "Raj",
bookId: "0786222727",
},
{
text: "Very expensive",
rating: 3,
name: "Yun",
bookId: "0786222727",
},
{
text: "Extremely satisfied with the storyline!",
rating: 5,
name: "Lisa",
bookId: "0786222727",
}
]);
```
</div>
</TabItem>
<TabItem value="mongosh" label="mongosh">
<div>
```js
db.reviews.insertMany([
{
text: "Thrilling end.",
rating: 4,
name: "Mark",
bookId: "0786222727",
},
{
text: "Must read!",
rating: 5,
name: "Raj",
bookId: "0786222727",
},
{
text: "Very expensive",
rating: 3,
name: "Yun",
bookId: "0786222727",
},
{
text: "Extremely satisfied with the storyline!",
rating: 5,
name: "Lisa",
bookId: "0786222727",
}
]);
```
</div>
</TabItem>
</Tabs>
</details>

### 👐 2. Delete all the reviews for `bookId` "0786222727" through a single command.

<details>
<summary>Answer</summary>
<div>
```js
db.reviews.deleteMany({"bookId": "0786222727"})
```
</div>
<Tabs groupId="challenges" defaultValue={"javascript"}>
<TabItem value="javascript" label="JavaScript">
<div>
```js
const reviews = db.collection("reviews");
await reviews.deleteMany({"bookId": "0786222727"})
```
</div>
</TabItem>
<TabItem value="mongosh" label="mongosh">
<div>
```js
db.reviews.deleteMany({"bookId": "0786222727"})
```
</div>
</TabItem>
</Tabs>
</details>
33 changes: 25 additions & 8 deletions docs/40-CRUD/5-UPDATE.mdx
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import Tabs from "@theme/Tabs";
import TabItem from "@theme/TabItem";

# 👐 UPDATE → updateOne(), updateMany()

To modify existing documents, MongoDB provides:
Expand Down Expand Up @@ -82,12 +85,26 @@ Executing the above command will insert a fresh new document in the collection,

<details>
<summary>Answer</summary>
<div>
```js
db.books.updateOne(
{"title": "Treasure of the Sun"},
{$set: {pages: 449}}
);
```
</div>
<Tabs groupId="challenges" defaultValue={"javascript"}>
<TabItem value="javascript" label="JavaScript">
<div>
```js
await books.updateOne(
{"title": "Treasure of the Sun"},
{$set: {pages: 449}}
);
```
</div>
</TabItem>
<TabItem value="mongosh" label="mongosh">
<div>
```js
db.books.updateOne(
{"title": "Treasure of the Sun"},
{$set: {pages: 449}}
);
```
</div>
</TabItem>
</Tabs>
</details>
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