Map creation in Go - Mini Project: Build & Apply

Map creation

📖 Scenario: You are creating a simple program to store and look up the prices of fruits in a store.

🎯 Goal: Build a Go program that creates a map with fruit names as keys and their prices as values.

📋 What You'll Learn

Create a map called fruitPrices with exact entries

Add a variable called newFruit with the value "Mango"

Add a new entry to the map using newFruit as the key and 120 as the value

Print the entire fruitPrices map

💡 Why This Matters

🌍 Real World

Maps are used to store related data where you want to quickly find a value by a key, like looking up prices by product names.

💼 Career

Understanding maps is important for many programming jobs because they help organize and access data efficiently.

1

Create the initial map

Create a map called fruitPrices with these exact entries: "Apple": 100, "Banana": 30, "Cherry": 75

Go

# Your code here

Hint

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

2

Add a new fruit variable

Add a variable called newFruit and set it to the string "Mango"

Go

package main

import "fmt"

func main() {
    fruitPrices := map[string]int{"Apple": 100, "Banana": 30, "Cherry": 75}
    // Your code here
}

Hint

Use newFruit := "Mango" to create the variable.

3

Add the new fruit to the map

Add a new entry to the fruitPrices map using newFruit as the key and 120 as the value

Go

package main

import "fmt"

func main() {
    fruitPrices := map[string]int{"Apple": 100, "Banana": 30, "Cherry": 75}
    newFruit := "Mango"
    // Your code here
}

Hint

Use fruitPrices[newFruit] = 120 to add the new entry.

4

Print the map

Print the entire fruitPrices map using fmt.Println

Go

package main

import "fmt"

func main() {
    fruitPrices := map[string]int{"Apple": 100, "Banana": 30, "Cherry": 75}
    newFruit := "Mango"
    fruitPrices[newFruit] = 120
    // Your code here
}

Hint

Use fmt.Println(fruitPrices) to display the map.