Adding and updating values in Go - Mini Project: Build & Apply

Adding and updating values

📖 Scenario: You are managing a small store's inventory. You want to keep track of how many items you have for each product.

🎯 Goal: Create a Go program that stores product quantities in a map, adds a new product, updates the quantity of an existing product, and then shows the final inventory.

📋 What You'll Learn

Create a map called inventory with initial products and quantities

Add a new product with a quantity to the inventory map

Update the quantity of an existing product in the inventory map

Print the final inventory map

💡 Why This Matters

🌍 Real World

Stores and businesses often track their inventory using maps or dictionaries to know how many items they have.

💼 Career

Understanding how to add and update values in maps is essential for managing data in many programming jobs, especially in backend development and data processing.

1

Create the initial inventory map

Create a map called inventory with these exact entries: "apple": 10, "banana": 5, and "orange": 8.

Go

// Create the inventory map with initial products
// Your code here

Hint

Use map[string]int to create a map with string keys and int values.

2

Add a new product to the inventory

Add a new product "grape" with quantity 12 to the inventory map.

Go

package main

import "fmt"

func main() {
    inventory := map[string]int{"apple": 10, "banana": 5, "orange": 8}
    // Add grape with quantity 12
    // Your code here
}

Hint

Use inventory["grape"] = 12 to add a new key and value to the map.

3

Update the quantity of an existing product

Update the quantity of "banana" in the inventory map to 7.

Go

package main

import "fmt"

func main() {
    inventory := map[string]int{"apple": 10, "banana": 5, "orange": 8}
    inventory["grape"] = 12
    // Update banana quantity to 7
    // Your code here
}

Hint

Assign the new quantity to inventory["banana"].

4

Print the final inventory

Print the inventory map to show all products and their quantities.

Go

package main

import "fmt"

func main() {
    inventory := map[string]int{"apple": 10, "banana": 5, "orange": 8}
    inventory["grape"] = 12
    inventory["banana"] = 7
    // Print the inventory map
    // Your code here
}

Hint

Use fmt.Println(inventory) to print the map.