Performance testing with measure blocks in Swift - Mini Project: Build & Apply

Performance Testing with Measure Blocks in Swift

📖 Scenario: You are working on a Swift app that processes a list of numbers. You want to check how fast your code runs when doubling each number. This helps you make sure your app stays quick and smooth.

🎯 Goal: Build a simple performance test using Swift's measure block to time how long it takes to double numbers in an array.

📋 What You'll Learn

Create an array called numbers with the values [1, 2, 3, 4, 5]

Create a variable called doubledNumbers to store results

Use a measure block to time the doubling process

Print the doubledNumbers array after the test

💡 Why This Matters

🌍 Real World

Performance testing helps developers find slow parts in their apps and improve user experience by making code faster.

💼 Career

Knowing how to measure and optimize code speed is important for software engineers to build efficient and responsive applications.

1

Create the numbers array

Create an array called numbers with these exact values: [1, 2, 3, 4, 5]

Swift

# Create the numbers array
# Your code here

Need a hint?

Use let numbers = [1, 2, 3, 4, 5] to create the array.

2

Create the doubledNumbers variable

Create a variable called doubledNumbers and set it to an empty array of integers []

Swift

let numbers = [1, 2, 3, 4, 5]
# Create the doubledNumbers variable as an empty array
# Your code here

Need a hint?

Use var doubledNumbers: [Int] = [] to create an empty array.

3

Use measure block to double numbers

Use measure block to time the process of doubling each number in numbers. Inside the block, use a for loop with number to multiply each by 2 and append to doubledNumbers

Swift

let numbers = [1, 2, 3, 4, 5]
var doubledNumbers: [Int] = []

// Use measure block below
# Your code here

Need a hint?

Use measure { ... } and inside it a for number in numbers loop to append doubled values.

4

Print the doubledNumbers array

Write print(doubledNumbers) to display the doubled numbers after the measure block

Swift

let numbers = [1, 2, 3, 4, 5]
var doubledNumbers: [Int] = []

measure {
    for number in numbers {
        doubledNumbers.append(number * 2)
    }
}

# Print the doubledNumbers array
# Your code here

Need a hint?

Use print(doubledNumbers) to show the result.