Ruby - Metaprogramming Fundamentals
Which of the following is the correct syntax to set an instance variable
@title to "Developer" using instance_variable_set on object obj?Which of the following is the correct syntax to set an instance variable @title to "Developer" using instance_variable_set on object obj?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Understand argument format for instance_variable_set
The first argument must be the instance variable name as a symbol or string, including the '@' prefix.Step 2: Check each option
obj.instance_variable_set(:title, "Developer") misses '@'. obj.instance_variable_set("title", "Developer") misses '@'. obj.instance_variable_set(:@title, "Developer") uses :@title symbol correctly. obj.instance_variable_set(@title, "Developer") passes a variable without quotes or symbol, which is invalid.Final Answer:
obj.instance_variable_set(:@title, "Developer") -> Option CQuick Check:
Use symbol with '@' for instance_variable_set [OK]
Quick Trick: Prefix variable name with '@' and use symbol for setting [OK]
Common Mistakes:
- Omitting '@' in variable name
- Passing variable name without quotes or symbol
- Using string without '@' prefix
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