How can you use Ruby's any?, all?, and none? methods together to check if an array of strings contains at least one empty string, all strings have length less than 10, and none are nil?

hard📝 Application Q9 of 15

Ruby - Enumerable and Collection Processing

How can you use Ruby's any?, all?, and none? methods together to check if an array of strings contains at least one empty string, all strings have length less than 10, and none are nil?

Aarr.none?(&:empty?) || arr.all? { |s| s.length < 10 } || arr.any?(&:nil?)

Barr.any?(&:empty?) && arr.all? { |s| s.length < 10 } && arr.none?(&:nil?)

Carr.all?(&:empty?) && arr.any? { |s| s.length < 10 } && arr.none?(&:nil?)

Darr.any?(&:empty?) || arr.none? { |s| s.length < 10 } && arr.all?(&:nil?)

Step-by-Step Solution

Solution:

Step 1: Break down each condition
Check if any string is empty, all strings have length less than 10, and none are nil.
Step 2: Use predicates correctly
any?(&:empty?) checks for empty strings, all? { |s| s.length < 10 } checks length, and none?(&:nil?) ensures no nil values.
Final Answer:
arr.any?(&:empty?) && arr.all? { |s| s.length < 10 } && arr.none?(&:nil?) -> Option B
Quick Check:
Combine predicates with && for all conditions [OK]

Quick Trick: Use && to combine any?, all?, none? for multiple checks [OK]

Common Mistakes:

Using || instead of && to combine conditions
Mixing up any? and none? usage
Incorrect block syntax for predicates

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More Ruby Quizzes

How can you use Ruby's any?, all?, and none? methods together to check if an array of strings contains at least one empty string, all strings have length less than 10, and none are nil?

Step 1: Break down each condition

Step 2: Use predicates correctly

Final Answer:

Quick Check:

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