[Solved] Given this ~/.irbrc snippet:IRB.conf[:SAVE_HISTORY] = 1000 IRB.conf[:HISTORY_FILE] = ".irb_history"What will happen when you exit IRB? | Ruby

Ruby - Ecosystem and Best Practices

Given this ~/.irbrc snippet:

IRB.conf[:SAVE_HISTORY] = 1000
IRB.conf[:HISTORY_FILE] = ".irb_history"

What will happen when you exit IRB?

AThe last 1000 commands will be saved to the file ".irb_history"

BIRB will clear the history file on exit

CIRB will save only the last command to ".irb_history"

DNo history will be saved because the file name is invalid

Step-by-Step Solution

Solution:

Step 1: Understand the meaning of SAVE_HISTORY and HISTORY_FILE
SAVE_HISTORY sets how many commands to save; HISTORY_FILE sets the file name.
Step 2: Interpret the snippet
It saves the last 1000 commands to ".irb_history" on exit.
Final Answer:
The last 1000 commands will be saved to the file ".irb_history" -> Option A
Quick Check:
History saved count and file name = saved commands [OK]

Quick Trick: SAVE_HISTORY sets count; HISTORY_FILE sets file name [OK]

Common Mistakes:

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