Zip for combining sequences in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to combine two arrays using zip and print the pairs.

Swift

let numbers = [1, 2, 3]
let words = ["one", "two", "three"]
for pair in [1](numbers, words) {
    print(pair)
}

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

Amerge

Bcombine

Czip

Djoin

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'combine' or 'merge' which are not Swift functions for this purpose.

The zip function combines two sequences into pairs.

2fill in blank

medium

Complete the code to print the first elements of each pair from zipped arrays.

Swift

let a = [10, 20, 30]
let b = ["A", "B", "C"]
for ([1], _) in zip(a, b) {
    print([1])
}

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Ax

Bfirst

Celement

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'first' which is a property, not a variable name here.

The variable 'x' is used to capture the first element in the tuple.

3fill in blank

hard

Fix the error in the code to correctly zip and print pairs.

Swift

let nums = [1, 2, 3]
let strs = ["one", "two", "three"]
for pair in zip(nums, [1]) {
    print(pair)
}

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

Astrs

Bstrings

Cstr

Dstrs()

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'strings' or 'strs()' which are undefined or incorrect syntax.

The variable 'strs' holds the second array to zip with 'nums'.

4fill in blank

hard

Fill both blanks to create a dictionary from zipped arrays where keys are numbers and values are words.

Swift

let keys = [1, 2, 3]
let values = ["one", "two", "three"]
let dict = Dictionary(uniqueKeysWithValues: [1](keys, [2]))

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Azip

Bvalues

Ckeys

Denumerated

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'enumerated' which is not for pairing two sequences.

Use zip to pair keys and values arrays to create the dictionary.

5fill in blank

hard

Fill all three blanks to filter zipped pairs where the number is greater than 1 and print the word.

Swift

let nums = [1, 2, 3]
let words = ["one", "two", "three"]
for ([1], [2]) in zip(nums, words) where [1] > 1 {
    print([2])
}

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

Anum

Bword

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names or wrong variables in the condition.

Use 'num' and 'word' as variable names; filter where num > 1 and print word.