[Solved] What is wrong with this code snippet? str = "Hi" str — Ans: You cannot append nil using << operator; it causes an error. | Ruby

Ruby - String Operations

What is wrong with this code snippet?

str = "Hi"
str << nil
puts str

Anil is converted to "nil" string automatically.

BYou cannot append nil using << operator; it causes an error.

CThe code will output "Hi" without changes.

DThe << operator ignores nil values silently.

Step-by-Step Solution

Solution:

Step 1: Understand << operator argument requirements
The << operator requires a string argument; nil is not a string.
Step 2: Check behavior when appending nil
Appending nil raises a TypeError because nil cannot be converted to string automatically.
Final Answer:
You cannot append nil using << operator; it causes an error. -> Option B
Quick Check:
Appending nil with << causes error [OK]

Quick Trick: Never append nil directly; convert or check first [OK]

Common Mistakes:

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