docs: add step for constant values

content/02-Primitive-Types/08-Defining-Constant-Values/code.ts

@@ -0,0 +1,76 @@
+const code: any = {
+  type: "object",
+  properties: {
+    name: {
+      type: "string",
+    },
+    age: {},
+    companyName: {},
+  },
+};
+
+const solution = structuredClone(code);
+solution.properties.companyName = {
+  const: "Postman",
+};
+
+solution.properties.age = {
+  const: 25,
+};
+
+const testCases: any[] = [
+  {
+    input: {
+      name: "person",
+      age: 25,
+      companyName: "Postman",
+    },
+    expected: true,
+  },
+  {
+    input: {
+      name: "person",
+      age: 25,
+      companyName: "Google",
+    },
+    expected: false,
+  },
+  {
+    input: {
+      name: "person",
+      age: 26,
+      companyName: "Postman",
+    },
+    expected: false,
+  },
+  {
+    input: {
+      name: "person",
+      age: 26,
+      companyName: "Google",
+    },
+    expected: false,
+  },
+  {
+    input: {
+      name: "person",
+      age: 24,
+      companyName: "Postman",
+    },
+    expected: false,
+  },
+  {
+    input: {
+      name: 0,
+      age: 25,
+      companyName: "Postman",
+    },
+    expected: false,
+  },
+];
+
+module.exports = {
+  code,
+  solution,
+  testCases,
+};

content/02-Primitive-Types/08-Defining-Constant-Values/instructions.mdx

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+---
+title: Defining Constant Values
+description: Learn to Define constant values in JSON Schema.
+keywords:  const, constant, JSON Schema
+---
+
+# Constant Values
+
+So far, we have used the `enum` keyword to define a list of allowed values for a property. But **what if you want to define a single constant value for a property?**
+
+Consider, you want to define a property `companyName` with a constant value `Postman`. any other value for `companyName` should be considered invalid.
+
+```json highlightLineStart={4}
+{
+  "name":"John Doe",
+  "age": 25,
+  "companyName": "Postman"
+}
+```
+
+## Const Keyword
+
+The `const` keyword is used to define a single constant value for a property. The value of the `const` keyword **can be any valid JSON value**.
+
+**Example**
+
+```json
+{
+  "const": "Postman"
+}
+```
+
+Now, try to add a new property `companyName` in the JSON object such that it should have a constant value `Postman`.
+
+Just for practice, we will also **set the age to a constant value of 25**.
+
+
+
+
+<GoodToKnowBox>
+- Values defined in `const` are case-sensitive. So `Postman` and `postman` are considered different values.
+- You don't need to add `type` keywords when using `const`. The `const` keyword itself implies the type of the value.
+</GoodToKnowBox>