How do you correctly create a lazy enumerator from the array [2, 4, 6] in Ruby?

easy📝 Syntax Q3 of 15

Ruby - Functional Patterns in Ruby

How do you correctly create a lazy enumerator from the array [2, 4, 6] in Ruby?

A[2, 4, 6].lazy_enum

B[2, 4, 6].to_enum.lazy

CLazyEnumerator.new([2, 4, 6])

D[2, 4, 6].lazy

Step-by-Step Solution

Solution:

Step 1: Understand Ruby's lazy enumerator creation
Ruby provides the .lazy method directly on Enumerable objects to create lazy enumerators.
Step 2: Check each option
- [2, 4, 6].lazy is the correct syntax.
- [2, 4, 6].to_enum.lazy is redundant but valid; however, to_enum returns an Enumerator, so chaining .lazy works but is unnecessary.
- LazyEnumerator.new([2, 4, 6]) is invalid as LazyEnumerator is not a Ruby class.
- [2, 4, 6].lazy_enum is invalid; no such method exists.
Final Answer:
[2, 4, 6].lazy -> Option D
Quick Check:
Directly call .lazy on the array [OK]

Quick Trick: Use .lazy directly on the enumerable [OK]

Common Mistakes:

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