Get all arrays of consecutive elements

Slide a window of a given size across an array.

JavaScript Version 1.0.0 · MIT · .md

function windows({ values, size }) { return size > values.length ? [] : values.slice(size - 1).map((_, i) => values.slice(i, i + size)); }

Input & expected output

{
  "values": [
    1,
    2,
    3,
    4
  ],
  "size": 2
}

[
  [
    1,
    2
  ],
  [
    2,
    3
  ],
  [
    3,
    4
  ]
]

The edge case

{
  "values": [
    1,
    2
  ],
  "size": 3
}

[]

Know the limits

• A window larger than the array yields no windows.

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.