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Level 3 · Advanced · Structure and efficiency

Compute rolling medians

Maintain sliding medians for odd and even windows.

Problem statement

Write function solution(values, windowSize). Inputs and outputs are JSON values. Do not modify input arrays or objects. External libraries, network access, and asynchronous functions are not supported. values:integer[] (-10^6…10^6), windowSize:integer 1–1024. Return the median of every consecutive full window in input order. For odd windows use the middle sorted value; for even windows average the two middle values. If fewer values than the window size, return []. Do not mutate input. Input limits: at most 50,000 items per input array and 1,000 characters per string. Numbers are finite; integers and accumulated integer results stay in the JavaScript safe-integer range. Other types and validity rules follow the statement above.

Example input and output

Example 1

Function arguments

[
  [
    1,
    3,
    2,
    5,
    4
  ],
  3
]

Return value

[
  2,
  3,
  4
]
Example 2

Function arguments

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

Return value

[
  1.5,
  2.5,
  3.5
]
Example 3

Function arguments

[
  [
    0,
    0,
    -1,
    1
  ],
  2
]

Return value

[
  0,
  -0.5,
  0
]
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Add your test · optional

Enter a JSON argument array in values, windowSize order. Your test runs alongside the three examples.

Save both files in one folder and run this command with Node.js. Read the checks field for individual example results.

node verify-rolling-median.mjs
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