Ruby - Arrays
How can you safely access the last element of an array
arr that might be empty, without causing an error?How can you safely access the last element of an array arr that might be empty, without causing an error?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand behavior of arr.last on empty array
arr.last returns nil if the array is empty, no error occurs.Step 2: Compare with other options
arr[-1] returns nil too, but arr[arr.length] is out of range and returns nil; arr.first if arr.empty? is unrelated.Final Answer:
Use arr.last which returns nil if empty -> Option BQuick Check:
arr.last safely returns nil on empty array [OK]
Quick Trick: arr.last returns nil safely even if array is empty [OK]
Common Mistakes:
- Thinking arr[-1] raises error
- Using arr[arr.length] which is out of range
- Confusing first and last methods
Master "Arrays" in Ruby
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore Ruby Quizzes