[Solved] This ~/.irbrc snippet causes an error:IRB.conf[:PROMPT_MODE] = SIMPLEWhy? — Ans: SIMPLE should be a symbol (:SIMPLE), not a bare word | Ruby

Ruby - Ecosystem and Best Practices

This ~/.irbrc snippet causes an error:

IRB.conf[:PROMPT_MODE] = SIMPLE

Why?

APROMPT_MODE is a string key, not a symbol

BIRB.conf is read-only and cannot be assigned

CSIMPLE should be a symbol (:SIMPLE), not a bare word

DThe assignment operator is missing

Step-by-Step Solution

Solution:

Step 1: Identify the syntax error
In Ruby, bare words like SIMPLE are undefined constants unless declared.
Step 2: Correct usage for prompt modes
Prompt modes are symbols, so it should be :SIMPLE.
Final Answer:
SIMPLE should be a symbol (:SIMPLE), not a bare word -> Option C
Quick Check:
Use symbols (colon prefix) for IRB prompt modes [OK]

Quick Trick: Always prefix prompt modes with a colon for symbols [OK]

Common Mistakes:

Master "Ecosystem and Best Practices" in Ruby

9 interactive learning modes - each teaches the same concept differently

More Ruby Quizzes

This ~/.irbrc snippet causes an error: