[Applied] Build a Simple Inventory Management Tool

In this lesson you will build a simple inventory management program using a map in Go, putting everything you have learned together. This is for anyone searching for "Go inventory management applied implementation".

Combine the maps and functions you have learned so far into a program that tracks stock levels. A map looks up and updates values quickly by key, which makes it one of the most heavily used data structures in real applications.

The sample code creates a map for stock with items := map[string]int{}, sets quantities by product name as in items["apple"] = 10, and reduces stock with items["apple"] -= 3 before printing the latest values.

A common stumbling block for beginners is what happens when you reach for a key that does not exist. A Go map returns the zero value rather than raising an error, and without knowing that you can be puzzled by the result.

The structs, error handling, and slices you have learned here are core Go skills that carry over directly into real backend and CLI development.

📖 Reference code

package main

import "fmt"

func main() {
    items := map[string]int{}
    items["apple"] = 10
    items["orange"] = 5
    items["apple"] -= 3
    fmt.Printf("apple: %d\n", items["apple"])
    fmt.Printf("orange: %d\n", items["orange"])
}

✍️ Your code

Type your code, then press "Run"

🧪 This site can't compile or run Go directly, so it checks on the spot whether what you typed matches the reference code (scoring happens entirely in your browser — nothing is sent anywhere).