Practical use cases in Go - Mini Project: Build & Apply

Practical use cases

📖 Scenario: You are working on a small store inventory system. You want to keep track of products and their prices, then find which products are affordable under a certain budget.

🎯 Goal: Build a Go program that stores product prices, sets a budget limit, filters products affordable within that budget, and prints the affordable products.

📋 What You'll Learn

Create a map called products with product names as keys and prices as float64 values

Create a variable called budget with a float64 value

Use a for loop to find products with prices less than or equal to budget

Store affordable products in a new map called affordable

Print the affordable map

💡 Why This Matters

🌍 Real World

Managing product prices and budgets is common in retail and inventory systems.

💼 Career

Understanding maps, loops, and conditionals in Go is essential for backend and systems programming jobs.

1

Create the products map

Create a map called products with these exact entries: "Apple": 1.20, "Banana": 0.80, "Cherry": 2.50, "Date": 3.00, "Eggplant": 1.50

Go

package main

func main() {
    // Create the products map here
}

Hint

Use a map literal with string keys and float64 values.

2

Set the budget variable

Create a variable called budget with the float64 value 2.00 inside the main function, below the products map.

Go

package main

func main() {
    products := map[string]float64{
        "Apple": 1.20,
        "Banana": 0.80,
        "Cherry": 2.50,
        "Date": 3.00,
        "Eggplant": 1.50,
    }
    // Create the budget variable here
}

Hint

Use a simple variable declaration with := and a float64 value.

3

Filter affordable products

Create a new map called affordable of type map[string]float64. Use a for loop with variables product and price to iterate over products. Inside the loop, add products with price less than or equal to budget to the affordable map.

Go

package main

func main() {
    products := map[string]float64{
        "Apple": 1.20,
        "Banana": 0.80,
        "Cherry": 2.50,
        "Date": 3.00,
        "Eggplant": 1.50,
    }
    budget := 2.00
    // Create affordable map and filter products here
}

Hint

Use make to create the map, then a for loop with range to iterate.

4

Print the affordable products

Use fmt.Println to print the affordable map. Remember to import the fmt package at the top.

Go

package main

import "fmt"

func main() {
    products := map[string]float64{
        "Apple": 1.20,
        "Banana": 0.80,
        "Cherry": 2.50,
        "Date": 3.00,
        "Eggplant": 1.50,
    }
    budget := 2.00
    affordable := make(map[string]float64)
    for product, price := range products {
        if price <= budget {
            affordable[product] = price
        }
    }
    // Print the affordable map here
}

Hint

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