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What is a dictionary in Swift used for?

easy📝 Conceptual Q11 of 15
Swift - Collections
What is a dictionary in Swift used for?
ATo store data in key-value pairs for quick lookup
BTo store a list of values without keys
CTo perform mathematical calculations
DTo create user interface elements
Step-by-Step Solution
Solution:

  1. Step 1: Understand dictionary purpose

    Dictionaries store data as pairs of keys and values, allowing fast access by key.

  2. Step 2: Compare options

    Only To store data in key-value pairs for quick lookup correctly describes this key-value storage purpose.

  3. Final Answer:

    To store data in key-value pairs for quick lookup -> Option A

  4. Quick Check:

    Dictionaries = key-value storage [OK]
Quick Trick: Remember: dictionaries pair keys with values for fast access [OK]
Common Mistakes:
  • Confusing dictionaries with arrays (which have no keys)
  • Thinking dictionaries perform calculations
  • Assuming dictionaries create UI elements

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