Ruby - Variables and Data Types
Given Ruby's dynamic and strong typing, which code snippet correctly concatenates a number and a string without error?
Given Ruby's dynamic and strong typing, which code snippet correctly concatenates a number and a string without error?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Identify valid concatenation
Ruby requires both operands to be strings for + concatenation.Step 2: Check options
num = 5 str = " apples" puts num.to_s + str converts num to string before adding, so no error. num = 5 str = " apples" puts num + str causes TypeError. num = 5 str = " apples" puts str + num tries string + integer, error. num = 5 str = " apples" puts str * num repeats string 5 times, valid but not concatenation.Final Answer:
num = 5 str = " apples" puts num.to_s + str -> Option DQuick Check:
Convert number to string before concatenation [OK]
Quick Trick: Convert numbers to strings before concatenation [OK]
Common Mistakes:
- Trying to add string and integer directly
- Confusing string repetition with concatenation
- Ignoring type errors on + operator
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