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Why does StringBuilder improve performance compared to string concatenation internally?

hard🧠 Conceptual Q10 of Q15
C Sharp (C#) - Strings and StringBuilder
Why does StringBuilder improve performance compared to string concatenation internally?
ABecause it encrypts strings for faster access
BBecause it compresses strings automatically
CBecause it uses a mutable buffer to avoid creating new string objects
DBecause it stores strings in a linked list
Step-by-Step Solution
Solution:

  1. Step 1: Understand string immutability in C#

    Strings are immutable; concatenation creates new objects each time.

  2. Step 2: How StringBuilder works internally

    It uses a mutable character buffer that grows as needed, avoiding new string creation.

  3. Final Answer:

    Because it uses a mutable buffer to avoid creating new string objects -> Option C

  4. Quick Check:

    Mutable buffer = StringBuilder performance [OK]
Quick Trick: Mutable buffer avoids new string creation [OK]
Common Mistakes:
MISTAKES
  • Thinking StringBuilder compresses strings
  • Assuming it uses linked lists internally
  • Believing it encrypts strings

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