Swift REPL and Playgrounds - Mini Project: Build & Apply

Exploring Swift REPL and Playgrounds

📖 Scenario: You are learning how to use Swift's REPL (Read-Eval-Print Loop) and Playgrounds to quickly test and run Swift code snippets. This helps you experiment with Swift code in a simple and interactive way, just like trying out ideas on paper before writing a full program.

🎯 Goal: Build a simple Swift program step-by-step using REPL or Playgrounds. You will create variables, configure a helper value, write a loop to process data, and finally print the result. This will help you get comfortable with Swift syntax and the interactive coding environment.

📋 What You'll Learn

Create a dictionary with exact keys and values

Add a configuration variable with a specific value

Use a for loop with exact variable names to process the dictionary

Print the final result exactly as specified

💡 Why This Matters

🌍 Real World

Filtering data based on conditions is common in apps, like showing only available items or filtering search results.

💼 Career

Understanding how to quickly test and run Swift code in REPL or Playgrounds is useful for developers to prototype ideas and debug code efficiently.

1

Create a dictionary of fruits and their quantities

Create a dictionary called fruits with these exact entries: "apple": 3, "banana": 5, "orange": 2

Swift

# Create the dictionary called fruits with the exact entries
# Your code here

Need a hint?

Use square brackets to create a dictionary. Use colons to separate keys and values.

2

Add a minimum quantity threshold

Create a variable called minQuantity and set it to 3

Swift

var fruits = ["apple": 3, "banana": 5, "orange": 2]
# Create the variable minQuantity and set it to 3
# Your code here

Need a hint?

Use var to create a variable and assign the number 3.

3

Filter fruits with quantity at least the threshold

Create a variable called filteredFruits and use a for loop with variables fruit and quantity to iterate over fruits. Add fruits with quantity greater than or equal to minQuantity to filteredFruits dictionary.

Swift

var fruits = ["apple": 3, "banana": 5, "orange": 2]
var minQuantity = 3
# Create filteredFruits dictionary and use a for loop to add fruits with quantity >= minQuantity
# Your code here

Need a hint?

Start with an empty dictionary. Use a for loop to check each fruit's quantity. Add only those that meet the threshold.

4

Print the filtered fruits dictionary

Write print(filteredFruits) to display the filtered fruits dictionary

Swift

var fruits = ["apple": 3, "banana": 5, "orange": 2]
var minQuantity = 3
var filteredFruits = [String: Int]()
for (fruit, quantity) in fruits {
    if quantity >= minQuantity {
        filteredFruits[fruit] = quantity
    }
}
# Print the filteredFruits dictionary
# Your code here

Need a hint?

Use the print function to show the dictionary. The output should only include fruits with quantity 3 or more.