Given an array of numbers, how would you use Ruby predicates to check if none of the numbers are zero and all are positive?

hard📝 Application Q8 of 15

Ruby - Enumerable and Collection Processing

Given an array of numbers, how would you use Ruby predicates to check if none of the numbers are zero and all are positive?

Aarr.any? { |n| n == 0 } && arr.all? { |n| n > 0 }

Barr.none? { |n| n == 0 } && arr.all? { |n| n > 0 }

Carr.none? { |n| n > 0 } || arr.all? { |n| n == 0 }

Darr.all? { |n| n == 0 } && arr.none? { |n| n > 0 }

Step-by-Step Solution

Solution:

Step 1: Understand the conditions
We want to confirm no zeros and all positive numbers.
Step 2: Use none? to check no zeros and all? to check positivity
none? { |n| n == 0 } ensures no zeros, and all? { |n| n > 0 } ensures all are positive.
Final Answer:
arr.none? { |n| n == 0 } && arr.all? { |n| n > 0 } -> Option B
Quick Check:
Combine none? and all? with && for multiple conditions [OK]

Quick Trick: Combine none? and all? with && for multiple checks [OK]

Common Mistakes:

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