You have a list of user ages: ages = [12, 17, 20, 25, 30]. You want to check if none of the users are under 18 years old. Which Ruby code correctly performs this check?

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Ruby - Enumerable and Collection Processing

You have a list of user ages: ages = [12, 17, 20, 25, 30]. You want to check if none of the users are under 18 years old. Which Ruby code correctly performs this check?

Aages.any? { |age| age < 18 }

Bages.all? { |age| age < 18 }

Cages.none? { |age| age < 18 }

Dages.none? { |age| age >= 18 }

Step-by-Step Solution

Solution:

Step 1: Understand the condition to check
We want to confirm no user is under 18, meaning no age < 18.
Step 2: Choose the method that returns true if no elements match condition
none? returns true if no elements satisfy the block condition.
Step 3: Verify the block condition
The block { |age| age < 18 } checks if age is under 18.
Final Answer:
ages.none? { |age| age < 18 } -> Option C
Quick Check:
none? means no elements match condition [OK]

Quick Trick: Use none? to confirm no elements meet condition [OK]

Common Mistakes:

Using any? which checks if some match
Using all? which requires all to match
Reversing the condition inside none?

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You have a list of user ages: ages = [12, 17, 20, 25, 30]. You want to check if none of the users are under 18 years old. Which Ruby code correctly performs this check?

Step 1: Understand the condition to check

Step 2: Choose the method that returns true if no elements match condition

Step 3: Verify the block condition

Final Answer:

Quick Check:

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