Challenge 2 — Solution

Task: Given a raw JSON string {"name":"Laptop","price":999.99,
"inStock":true}, define a matching struct with appropriate json
tags, unmarshal it, and print each field.

package main

import (
	"encoding/json"
	"fmt"
)

type Product struct {
	Name    string  `json:"name"`
	Price   float64 `json:"price"`
	InStock bool    `json:"inStock"`
}

func main() {
	jsonData := []byte(`{"name":"Laptop","price":999.99,"inStock":true}`)

	var product Product
	err := json.Unmarshal(jsonData, &product)
	if err != nil {
		fmt.Println("Error:", err)
		return
	}

	fmt.Println(product.Name)
	fmt.Println(product.Price)
	fmt.Println(product.InStock)
}


Expected output:

Laptop
999.99
true

Notes:
- &product (a pointer) is required — json.Unmarshal writes the
  parsed values through that pointer into the real product variable;
  passing product alone would leave it unchanged.
- The struct's json tags must match the JSON's actual key names
  exactly (case-sensitive) for each field to populate correctly —
  here "name", "price", and "inStock" all match.
- []byte(`...`) converts the JSON text into the byte slice that
  json.Unmarshal expects as its input.