docs: add specifying length of an array section

content/04-Arrays/01-Specifying-Length-of-an-Array/code.ts

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+const code: any = {
+  type: "object",
+  properties: {
+    name: {
+      type: "string",
+    },
+    age: {
+      type: "integer",
+    },
+  },
+};
+
+const solution = structuredClone(code);
+solution.properties.phones = {
+  type: "array",
+  items: {
+    type: "string",
+    pattern: "^\\d{3}-\\d{3}-\\d{4}$",
+  },
+  minItems: 1,
+  maxItems: 3,
+};
+
+const testCases = [
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      phones: [],
+    },
+    expected: false,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      phones: ["123-456-7890"],
+    },
+    expected: true,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      phones: ["123-456-78900"],
+    },
+    expected: false,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      phones: ["1a3-456-7g90"],
+    },
+    expected: false,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      phones: ["1234567890"],
+    },
+    expected: false,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      phones: [213],
+    },
+    expected: false,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      phones: ["797-147-7454", "123-456-7890"],
+    },
+    expected: true,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      phones: ["797-147-7454", "123-456-7890", "123-006-7890"],
+    },
+    expected: true,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      phones: ["797-147-7454", "123-456-7890", "123-006-7890", "745-746-5584"],
+    },
+    expected: false,
+  },
+];
+
+module.exports = {
+  code,
+  solution,
+  testCases,
+};

content/04-Arrays/01-Specifying-Length-of-an-Array/instructions.mdx

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+---
+title: Specifying Length of an Array
+description: Learn to constrain the number of items in an array using JSON Schema.
+keywords: minItems, maxItems, items, validation, JSON, Schema, JSON Schema
+---
+
+
+# Arrays
+
+**Welcome,** to the Arrays module! In this module, you will learn how to use *JSON Schema* to validate arrays, apply constraints on the array items, and handle additional items in an array.
+
+## Specifying Length of an Array
+
+Consider the employee JSON Document, now has a new field: an array of phone numbers. 
+
+```json highlightLineStart={4}
+{
+  "name": "John Doe",
+  "age": 25,
+  "phones": ["123-456-7890", "987-654-3210"]
+}
+```
+
+
+### Schema for the Array
+
+In *JSON Schema*, you can specify the minimum and maximum number of items in an array using the `minItems` and `maxItems` keywords.
+
+**Example**
+
+```
+ {
+  "hobbies": {
+    "type": "array",
+    "items": {...}
+    "minItems": 1,
+    "maxItems": 5
+  }
+ }
+```
+Now, modify the `phones` property of the given schema on the side editor, and specify minimum items as `1` and maximum items as `3`. Additionally constrain the phone numbers to be in the format `xxx-xxx-xxxx`.
+
+> **Hint:** Use regular expression `/^\d{3}-\d{3}-\d{4}$/` with `pattern` keyword to validate the phone number format.

content/04-Arrays/index.mdx

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+---
+title: Arrays
+
+---