RecursiveCharacterTextSplitter in LangChain - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

How does RecursiveCharacterTextSplitter split text?

Given a long string input, how does RecursiveCharacterTextSplitter split the text when the chunk size is smaller than the input length?

LangChain

from langchain.text_splitter import RecursiveCharacterTextSplitter

text = "This is a long text that needs to be split into smaller chunks for processing."
splitter = RecursiveCharacterTextSplitter(chunk_size=20, chunk_overlap=5)
chunks = splitter.split_text(text)
print(chunks)

A ["This is a long text ", "that needs to be split ", "into smaller chunks ", "for processing."]

B ["This is a long text that needs to be split into smaller chunks for processing."]

C ["This is a long text that needs", " to be split into smaller", " chunks for processing."]

D ["This is a long text that ", "needs to be split into ", "smaller chunks for ", "processing."]

💡 Hint

Think about how the splitter uses chunk size and overlap to create smaller pieces.

RecursiveCharacterTextSplitter splits the text into chunks of the specified size with overlap. It tries to split at natural boundaries recursively, resulting in chunks like option A.

📝 Syntax

intermediate

Identify the syntax error in RecursiveCharacterTextSplitter usage

Which option contains a syntax error when creating a RecursiveCharacterTextSplitter instance?

LangChain

from langchain.text_splitter import RecursiveCharacterTextSplitter

splitter = RecursiveCharacterTextSplitter(chunk_size=100 chunk_overlap=20)

A splitter = RecursiveCharacterTextSplitter(chunk_size=100,chunk_overlap=20)

B splitter = RecursiveCharacterTextSplitter(chunk_size=100, chunk_overlap=20)

C splitter = RecursiveCharacterTextSplitter(chunk_size=100, chunk_overlap = 20)

D splitter = RecursiveCharacterTextSplitter(chunk_size=100 chunk_overlap=20)

💡 Hint

Check the commas between arguments.

Option D is missing a comma between chunk_size and chunk_overlap arguments, causing a syntax error.

❓ state_output

advanced

What is the number of chunks produced?

Using RecursiveCharacterTextSplitter with chunk_size=10 and chunk_overlap=2, how many chunks will be produced from the text "Hello world! This is LangChain."?

LangChain

from langchain.text_splitter import RecursiveCharacterTextSplitter

text = "Hello world! This is LangChain."
splitter = RecursiveCharacterTextSplitter(chunk_size=10, chunk_overlap=2)
chunks = splitter.split_text(text)
print(len(chunks))

A 3

B 4

C 6

D 5

💡 Hint

Consider chunk size and overlap to count chunks.

The text length is 31 characters. With chunk size 10 and overlap 2, chunks start every 8 characters: positions 0,8,16,24. This results in 4 chunks.

🔧 Debug

advanced

Why does this RecursiveCharacterTextSplitter code raise an error?

What error does the following code raise and why? from langchain.text_splitter import RecursiveCharacterTextSplitter splitter = RecursiveCharacterTextSplitter(chunk_size=5, chunk_overlap=10) chunks = splitter.split_text("Short text")

A ValueError: chunk_overlap cannot be larger than chunk_size

B TypeError: split_text() missing 1 required positional argument

C IndexError: string index out of range

D No error, returns chunks normally

💡 Hint

Check the relationship between chunk_size and chunk_overlap.

chunk_overlap must be less than chunk_size. Here chunk_overlap=10 is larger than chunk_size=5, causing a ValueError.

🧠 Conceptual

expert

How does RecursiveCharacterTextSplitter decide split points?

Which best describes how RecursiveCharacterTextSplitter chooses where to split text into chunks?

A It splits text strictly every chunk_size characters without considering word boundaries.

B It splits text only at whitespace characters, ignoring chunk size.

C It recursively tries to split at preferred separators like newlines or spaces, falling back to smaller separators if needed, to respect chunk size.

D It splits text randomly to create chunks of varying sizes.

💡 Hint

Think about how the splitter tries to keep chunks readable and natural.

RecursiveCharacterTextSplitter tries to split text at natural boundaries like newlines or spaces recursively, ensuring chunks do not exceed chunk_size and overlap is respected.