You want to build a sentence step by step by appending words stored in an array words = ["I", "love", "Ruby"]. Which code snippet correctly uses to create the sentence with spaces between words?

hard📝 Application Q15 of 15

Ruby - String Operations

You want to build a sentence step by step by appending words stored in an array words = ["I", "love", "Ruby"]. Which code snippet correctly uses << to create the sentence with spaces between words?

Asentence = ""; words.each { |w| sentence + w + " " }; sentence.strip!

Bsentence = ""; words.each { |w| sentence = w + " " }; sentence.strip!

Csentence = ""; words.each { |w| sentence << w << " " }; sentence.strip!

Dsentence = ""; words.each { |w| sentence + w << " " }; sentence.strip!

Step-by-Step Solution

Solution:

Step 1: Understand how to append words with spaces
We want to add each word and a space to the same string sentence using << which modifies in place.
Step 2: Analyze each option
sentence = ""; words.each { |w| sentence + w + " " }; sentence.strip! computes a new concatenated string but doesn't assign it back.sentence = ""; words.each { |w| sentence = w + " " }; sentence.strip! overwrites sentence with the current word + space each time.sentence = ""; words.each { |w| sentence << w << " " }; sentence.strip! correctly chains << to append the word then the space in place.sentence = ""; words.each { |w| sentence + w << " " }; sentence.strip! creates and modifies a temporary string but discards the result.
Final Answer:
sentence = ""; words.each { |w| sentence << w << " " }; sentence.strip! -> Option C
Quick Check:
Use chained << to append multiple strings [OK]

Quick Trick: Chain << to append multiple strings efficiently [OK]

Common Mistakes:

Using + which creates new strings inside loop
Mixing + and << incorrectly
Forgetting to remove trailing space with strip!

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You want to build a sentence step by step by appending words stored in an array words = ["I", "love", "Ruby"]. Which code snippet correctly uses to create the sentence with spaces between words?

Step 1: Understand how to append words with spaces

Step 2: Analyze each option

Final Answer:

Quick Check:

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