Split an array into chunks

Build consecutive chunks without changing the original array.

JavaScript Version 1.0.0 · MIT · .md

function chunk({ values, size }) { return Array.from({ length: Math.ceil(values.length / size) }, (_, i) => values.slice(i * size, (i + 1) * size)); }

Input & expected output

{
  "values": [
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]"
  ],
  "size": 5
}

[
  [
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]"
  ],
  [
    "[email protected]",
    "[email protected]"
  ]
]

The edge case

{
  "values": [],
  "size": 3
}

[]

Know the limits

• Size must be an integer from 1 to 1,000; zero is rejected before allocation.
• Chunks are shallow copies. The final chunk may be shorter.
• Example: Oveyon’s POST /v1/send accepts up to 5 recipients (to + cc + bcc) per message. Give each batch its own idempotency key; reusing one key returns the first batch’s message instead of sending the second.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Clone an array — Create a new array without copying the objects inside it.
• Remove duplicate values — Keep the first occurrence of each value, in its original order.
• Flatten a nested array — Turn a nested array into one sequence of values.