What will this Ruby code print?

medium📝 Predict Output Q5 of 15

Ruby - Functional Patterns in Ruby

[1, 2, 3, 4].map(&:to_s).join(",")

A["1", "2", "3", "4"]

B"1,2,3,4"

C"1234"

D[1, 2, 3, 4]

Step-by-Step Solution

Solution:

Step 1: Convert each number to string
map(&:to_s) changes each number to its string form: ["1", "2", "3", "4"].
Step 2: Join strings with commas
join(",") combines them into one string: "1,2,3,4".
Final Answer:
"1,2,3,4" -> Option B
Quick Check:
map + join output = "1,2,3,4" [OK]

Quick Trick: map converts, join combines into string [OK]

Common Mistakes:

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