Swift - Data Types
Given a tuple array: [(name: String, score: Int)], how do you create a new array of just the scores using tuple access?
Given a tuple array: [(name: String, score: Int)], how do you create a new array of just the scores using tuple access?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand tuple array and map
players is an array of tuples with named elements. To get scores, map each tuple to its score.Step 2: Check each option
let scores = players.map { $0.score } correctly maps to $0.score. let scores = players.map { $0[1] } tries index access (invalid for named tuples). let scores = players.filter { $0.score } uses filter incorrectly. let scores = players.reduce(0) { $0.score + $1.score } reduces to sum, not array.Final Answer:
let scores = players.map { $0.score } -> Option BQuick Check:
Use map with named tuple property to extract values [OK]
Quick Trick: Use map and dot notation to extract tuple elements [OK]
Common Mistakes:
- Using index access on named tuples
- Confusing filter with map
- Using reduce when array needed
Master "Data Types" in Swift
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore Swift Quizzes