Given a hash scores = {alice: 10, bob: 20, carol: 30}, how do you update Bob's score to 50 and add a new key :dave with value 40 in one line?

hard📝 Application Q8 of 15

Ruby - Hashes

Given a hash scores = {alice: 10, bob: 20, carol: 30}, how do you update Bob's score to 50 and add a new key :dave with value 40 in one line?

Ascores[bob], scores[dave] = 50, 40

Bscores.update(bob: 50, dave: 40)

Cscores[:bob] = 50 scores[:dave] = 40

Dscores[:bob] == 50 && scores[:dave] == 40

Step-by-Step Solution

Solution:

Step 1: Understand hash update method
The update method merges new key-value pairs into the hash.
Step 2: Use update to change and add keys in one call
Calling scores.update(bob: 50, dave: 40) updates Bob's score and adds Dave.
Final Answer:
scores.update(bob: 50, dave: 40) -> Option B
Quick Check:
Use update to set multiple keys at once [OK]

Quick Trick: Use update method to set multiple hash keys at once [OK]

Common Mistakes:

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