Performance testing with measure blocks in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a performance test using measure block.

Swift

func testPerformanceExample() {
    self.[1] {
        // Code to measure
    }
}

Drag options to blanks, or click blank then click option'

Arun

Btest

Cexecute

Dmeasure

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'run' or 'execute' instead of 'measure'.

Forgetting to call the measure method on self.

The measure block is used in XCTest to measure performance of the code inside it.

2fill in blank

medium

Complete the code to measure the performance of sorting an array.

Swift

func testSortPerformance() {
    let array = [5, 3, 1, 4, 2]
    self.measure {
        let _ = array.[1]()
    }
}

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Aorder

Bsorted

Csort

Darrange

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'sort()' which sorts in place and returns void, causing errors.

Using non-existent methods like 'order' or 'arrange'.

The 'sorted()' method returns a sorted array without modifying the original, suitable for performance testing.

3fill in blank

hard

Fix the error in the measure block to correctly measure the performance of appending to an array.

Swift

func testAppendPerformance() {
    var array = [Int]()
    self.measure {
        array.[1](1)
    }
}

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Ainsert

Badd

Cappend

Dpush

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'add' or 'push' which are not valid Array methods in Swift.

Using 'insert' without specifying an index.

The correct method to add an element to the end of an array in Swift is 'append'.

4fill in blank

hard

Fill both blanks to measure the performance of reversing an array and assigning it to a new variable.

Swift

func testReversePerformance() {
    let array = [1, 2, 3, 4, 5]
    self.measure {
        let reversed = array.[1]()
        _ = reversed.[2]()
    }
}

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Areversed

Bsorted

Cmap

Dfilter

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'sorted()' which sorts instead of reversing.

Using 'map' or 'filter' which do not reverse arrays.

The 'reversed()' method returns a reversed collection. Calling it twice is valid but redundant here.

5fill in blank

hard

Fill all three blanks to measure the performance of filtering even numbers from an array and counting them.

Swift

func testFilterCountPerformance() {
    let numbers = [1, 2, 3, 4, 5, 6]
    self.measure {
        let evens = numbers.[1] { $0 [2] 2 == 0 }
        let count = evens.[3]
        _ = count
    }
}

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Afilter

B%

Ccount

Dmap

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'map' instead of 'filter' to select elements.

Using '==' instead of '%' to check even numbers.

Using 'count()' instead of the 'count' property.

Use 'filter' to select even numbers, '%' to check divisibility, and 'count' to count them.