Deleting map entries in Go - Mini Project: Build & Apply

Deleting map entries

📖 Scenario: You have a map of fruits and their quantities in a store. Sometimes, fruits run out of stock and need to be removed from the map.

🎯 Goal: Learn how to delete entries from a Go map when the quantity is zero.

📋 What You'll Learn

Create a map called inventory with exact fruit names and quantities

Create a variable called threshold set to 0

Use a for loop with variables fruit and quantity to iterate over inventory

Delete entries from inventory where quantity is equal to threshold

Print the final inventory map

💡 Why This Matters

🌍 Real World

Managing inventory data where items with zero stock need to be removed to keep the data clean.

💼 Career

Understanding how to manipulate maps and remove entries is important for backend development, data processing, and managing state in Go applications.

1

Create the initial inventory map

Create a map called inventory with these exact entries: "apple": 5, "banana": 0, "orange": 3, "grape": 0

Go

// Your code here

Hint

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

2

Add a threshold variable

Create an integer variable called threshold and set it to 0

Go

package main

import "fmt"

func main() {
    inventory := map[string]int{"apple": 5, "banana": 0, "orange": 3, "grape": 0}
    // Your code here
}

Hint

Use threshold := 0 to create the variable.

3

Delete entries with quantity equal to threshold

Use a for loop with variables fruit and quantity to iterate over inventory. Inside the loop, delete the entry from inventory if quantity is equal to threshold

Go

package main

import "fmt"

func main() {
    inventory := map[string]int{"apple": 5, "banana": 0, "orange": 3, "grape": 0}
    threshold := 0

    // Use a for loop to delete entries
    // Your code here
}

Hint

Use delete(map, key) to remove an entry from a map.

4

Print the updated inventory

Write fmt.Println(inventory) to display the updated inventory map

Go

package main

import "fmt"

func main() {
    inventory := map[string]int{"apple": 5, "banana": 0, "orange": 3, "grape": 0}
    threshold := 0

    for fruit, quantity := range inventory {
        if quantity == threshold {
            delete(inventory, fruit)
        }
    }

    // Your code here
}

Hint

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