[Solved] How can you use block parameters to swap keys and values in a hash?h = {a: 1, b: 2} new_hash = {} h.each do |key, value| new_hash[value] = key end puts new_hashWhat is the output? | Ruby

Ruby - Blocks, Procs, and Lambdas

How can you use block parameters to swap keys and values in a hash?

h = {a: 1, b: 2}
new_hash = {}
h.each do |key, value|
  new_hash[value] = key
end
puts new_hash

What is the output?

AError: wrong number of block parameters

B{1=>:a, 2=>:b}

C{a=>1, b=>2}

D{}

Step-by-Step Solution

Solution:

Step 1: Understand hash iteration with two block parameters
Each key and value are passed to the block as parameters.
Step 2: Swap keys and values in new_hash
Assign new_hash[value] = key to invert the hash.
Final Answer:
{1=>:a, 2=>:b} -> Option B
Quick Check:
Block parameters key,value used to swap hash pairs [OK]

Quick Trick: Use two block parameters to access key and value in hashes [OK]

Common Mistakes:

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