[Solved] What will this code output?hash = {a: 1, b: 2, c: 3} new_hash = hash.map { |k, v| [k, v * 2] }.to_h puts new_hash.inspect | Ruby

Ruby - Blocks, Procs, and Lambdas

What will this code output?

hash = {a: 1, b: 2, c: 3}
new_hash = hash.map { |k, v| [k, v * 2] }.to_h
puts new_hash.inspect

A[[:a, 2], [:b, 4], [:c, 6]]

B{:a=>2, :b=>4, :c=>6}

C{a: 2, b: 4, c: 6}

DError

Step-by-Step Solution

Solution:

Step 1: Understand map on a hash
Mapping over a hash yields key-value pairs. The block returns an array with key and doubled value.
Step 2: Convert array of pairs back to hash
The to_h method converts the array of key-value pairs back into a hash with doubled values.
Final Answer:
{:a=>2, :b=>4, :c=>6} -> Option B
Quick Check:
map and to_h transform hash values = C [OK]

Quick Trick: Use map with to_h to transform hashes easily [OK]

Common Mistakes:

Master "Blocks, Procs, and Lambdas" in Ruby

9 interactive learning modes - each teaches the same concept differently

More Ruby Quizzes

What will this code output?