Given the array arr = [["name", "Dave"], [:age, 40], ["city", "NY"]], which code correctly converts it into a hash with symbol keys where possible?

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Ruby - Hashes

Given the array arr = [["name", "Dave"], [:age, 40], ["city", "NY"]], which code correctly converts it into a hash with symbol keys where possible?

Ahash = arr.to_h

Bhash = arr.map { |k, v| [k.to_sym, v] }.to_h

Chash = arr.map { |k, v| [k, v] }.to_h

Dhash = arr.map { |k, v| [k.to_s, v] }.to_h

Step-by-Step Solution

Solution:

Step 1: Understand the array structure
The array has pairs with keys as strings or symbols. We want all keys as symbols where possible.
Step 2: Convert keys to symbols
hash = arr.map { |k, v| [k.to_sym, v] }.to_h converts each key to symbol using k.to_sym before creating the hash, ensuring keys are symbols.
Step 3: Check other options
hash = arr.to_h keeps keys as is (mixed). hash = arr.map { |k, v| [k, v] }.to_h keeps keys as is without conversion. hash = arr.map { |k, v| [k.to_s, v] }.to_h converts all keys to strings, not symbols.
Final Answer:
hash = arr.map { |k, v| [k.to_sym, v] }.to_h -> Option B
Quick Check:
Use to_sym on keys to get symbol keys [OK]

Quick Trick: Use map with to_sym on keys to get symbol keys [OK]

Common Mistakes:

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