[Solved] Given this ~/.irbrc snippet:IRB.conf[:PROMPT_MODE] = :SIMPLE IRB.conf[:SAVE_HISTORY] = 1000What effect does this have when you start IRB? | Ruby

Ruby - Ecosystem and Best Practices

Given this ~/.irbrc snippet:

IRB.conf[:PROMPT_MODE] = :SIMPLE
IRB.conf[:SAVE_HISTORY] = 1000

What effect does this have when you start IRB?

ADisables command history and uses default prompt

BChanges prompt color but does not save history

CCauses a syntax error and IRB won't start

DSets a simple prompt and saves last 1000 commands in history

Step-by-Step Solution

Solution:

Step 1: Understand IRB.conf[:PROMPT_MODE]
Setting :PROMPT_MODE to :SIMPLE changes IRB prompt to a simple style.
Step 2: Understand IRB.conf[:SAVE_HISTORY]
Setting :SAVE_HISTORY to 1000 means IRB saves the last 1000 commands in history.
Final Answer:
Sets a simple prompt and saves last 1000 commands in history -> Option D
Quick Check:
Prompt = simple, History saved = 1000 [OK]

Quick Trick: Look for keys in IRB.conf to know prompt and history settings [OK]

Common Mistakes:

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