Swift - Data Types
You have a tuple representing a book: (title: String, author: String, year: Int). How do you swap the title and author values in Swift?
You have a tuple representing a book: (title: String, author: String, year: Int). How do you swap the title and author values in Swift?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand tuple with named elements
Tuple has named elements title, author, year. To swap title and author, assign them in a tuple swap.Step 2: Check syntax for swapping
var book = (title: "Swift Guide", author: "John Appleseed", year: 2023) (book.title, book.author) = (book.author, book.title) correctly declares named tuple and swaps title and author using tuple assignment.Step 3: Analyze other options
var book = ("Swift Guide", "John Appleseed", 2023) (book.title, book.author) = (book.author, book.title) lacks names, so title and author don't exist as properties. var book = (title: "Swift Guide", author: "John Appleseed", year: 2023) book = (book.author, book.title, book.year) changes order but loses names. var book = (title: "Swift Guide", author: "John Appleseed", year: 2023) book.swap(title, author) uses invalid swap method.Final Answer:
var book = (title: "Swift Guide", author: "John Appleseed", year: 2023) (book.title, book.author) = (book.author, book.title) -> Option AQuick Check:
Swap named tuple elements with tuple assignment [OK]
Quick Trick: Swap tuple elements by assigning a tuple of swapped values [OK]
Common Mistakes:
- Trying to swap unnamed tuple elements
- Using invalid methods like .swap()
- Reassigning tuple without names
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