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What will be the output of this Ruby code?

medium📝 Predict Output Q4 of 15
Ruby - String Operations
What will be the output of this Ruby code? 
str = "Hello"
str << " " << "World"
puts str
AHello << World
BHelloWorld
CHello World
DError: invalid syntax
Step-by-Step Solution
Solution:

  1. Step 1: Understand chaining of << operator

    The << operator returns the modified string, so chaining appends multiple strings.

  2. Step 2: Trace the string changes

    First append adds a space, second append adds "World", resulting in "Hello World".

  3. Final Answer:

    Hello World -> Option C

  4. Quick Check:

    Chained << appends strings in order [OK]
Quick Trick: << returns modified string, so you can chain it [OK]
Common Mistakes:
  • Thinking << doesn't chain
  • Expecting no space added
  • Confusing output with error

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