Swift - Collections
What does the
Dictionary's removeValue(forKey:) method return if the key exists?What does the Dictionary's removeValue(forKey:) method return if the key exists?
easy📝 Conceptual Q1 of 15
Step-by-Step Solution
Solution:
Step 1: Understand removeValue(forKey:) behavior
This method removes the key-value pair and returns the value if the key existed.Step 2: Check return type
The method returns an optional value of the removed key, or nil if the key was not found.Final Answer:
The value associated with the removed key -> Option AQuick Check:
removeValue(forKey:) returns removed value [OK]
Quick Trick: removeValue returns the removed value, not the key or Bool [OK]
Common Mistakes:
- Thinking it returns the key instead of the value
- Assuming it returns a Boolean
- Believing it returns nothing (Void)
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