Given the array words = ["cat", "dog", "bird", "cow"], which code snippet uses the match operator to find the first word containing the letter 'i' and returns its index in the array?

hard📝 Application Q15 of 15

Ruby - Regular Expressions

Given the array words = ["cat", "dog", "bird", "cow"], which code snippet uses the match operator to find the first word containing the letter 'i' and returns its index in the array?

Awords.find { |w| w =~ /i/ }

Bwords.find_index { |w| w =~ /i/ }

Cwords.index { |w| w.include?('i') }

Dwords.select { |w| w =~ /i/ }

Step-by-Step Solution

Solution:

Step 1: Understand the goal
We want the index of the first word containing 'i'.
Step 2: Use find_index with match operator
find_index returns the index of the first element where the block is true. Using w =~ /i/ returns index or nil, so truthy means match found.
Step 3: Check other options
words.index { |w| w.include?('i') } uses include? which works but is not using the match operator. words.find { |w| w =~ /i/ } returns the word, not index. words.select { |w| w =~ /i/ } returns all matches, not index.
Final Answer:
words.find_index { |w| w =~ /i/ } -> Option B
Quick Check:
find_index with =~ returns correct index [OK]

Quick Trick: Use find_index with =~ to get index of first match [OK]

Common Mistakes:

Using find instead of find_index for index
Using include? instead of =~
Expecting select to return single index

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More Ruby Quizzes

Given the array words = ["cat", "dog", "bird", "cow"], which code snippet uses the match operator to find the first word containing the letter 'i' and returns its index in the array?

Step 1: Understand the goal

Step 2: Use find_index with match operator

Step 3: Check other options

Final Answer:

Quick Check:

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