Swift - Collections
Which method would you use to add a new key-value pair or update an existing value in a Swift dictionary?
Which method would you use to add a new key-value pair or update an existing value in a Swift dictionary?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify method purpose
updateValue(_:forKey:) adds or updates a value for a given key in the dictionary.Step 2: Compare with other methods
removeValue removes, contains checks existence, keys returns keys list.Final Answer:
updateValue(_:forKey:) -> Option CQuick Check:
Use updateValue to add or update dictionary entries [OK]
Quick Trick: updateValue adds or updates key-value pairs [OK]
Common Mistakes:
- Confusing removeValue with updateValue
- Using contains to add or update values
- Thinking keys() modifies the dictionary
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