[Solved] Why does IRB use symbols like :SIMPLE instead of strings for prompt modes in ~/.irbrc? — Ans: Symbols are immutable and faster for repeated keys | Ruby

Ruby - Ecosystem and Best Practices

Why does IRB use symbols like :SIMPLE instead of strings for prompt modes in ~/.irbrc?

AStrings cause syntax errors in IRB config

BSymbols are immutable and faster for repeated keys

CSymbols automatically load prompt libraries

DStrings cannot be used as keys in Ruby hashes

Step-by-Step Solution

Solution:

Step 1: Understand symbols vs strings in Ruby
Symbols are immutable and unique, making them efficient for keys.
Step 2: Explain why IRB uses symbols for prompt modes
Using symbols avoids repeated string objects and speeds up lookup.
Final Answer:
Symbols are immutable and faster for repeated keys -> Option B
Quick Check:
Symbols optimize performance and memory in configs [OK]

Quick Trick: Symbols are efficient keys, preferred over strings [OK]

Common Mistakes:

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Why does IRB use symbols like :SIMPLE instead of strings for prompt modes in ~/.irbrc?