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Lesson 7 — Array chunking
Work in batches
Sending 10,000 emails at once can overload a server, so you split the list into chunks (batches) of a fixed size. slice(start, end) copies part of an array — the end index is not included.
[1, 2, 3, 4, 5].slice(2, 4); // [3, 4]
A loop that jumps by n each time and slices n items builds the chunks.
Why it matters: batching keeps memory and network use under control in real backends.
Want it another way?
Task
Finish chunk(): push a slice of n items on each step, so 5 numbers in groups of 2 make 3 batches.
Run your code — when the output matches the task, you will see a green check. Then mark the lesson complete.
Test your knowledge
Test your knowledgeA quick 3-question quiz on this lesson — instant feedback.