Group orders by status

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Group orders by status · UIHero

Group orders by status

Transform a flat order list into stable status groups without mutating the input.

EasyJavaScript Collections

20 min78.6% acceptance

Description

Implement groupOrdersByStatus so it returns an object keyed by each status found in the order list. Orders inside every group must keep their original relative order, and the source array and its objects must remain unchanged.

Requirements

The solution exports a callable function named groupOrdersByStatus.
Each order appears in the array whose object key exactly matches that order's status.
Orders within each status group retain their original relative order.
The returned object contains keys only for statuses present in the input.
An empty input array returns an empty object.
Calling the function does not mutate the input array or any input order object.

Repeated statuses

Input

[{ id: 'a', status: 'pending' }, { id: 'b', status: 'done' }, { id: 'c', status: 'pending' }]

Expected output

{ pending: [{ id: 'a', ... }, { id: 'c', ... }], done: [{ id: 'b', ... }] }

Explanation

The pending orders remain in the same order in which they appeared in the input.

Constraints

Do not mutate the input array or its order objects
Create groups only for statuses present in the input
Return an empty object for an empty array

Hints

Hint 1

Choose an accumulator whose keys can be created as new statuses appear.

Hint 2

Process orders from left to right so appending naturally preserves their relative order.

Hint 3

Place each original order into the collection associated with its status without changing the source.

arraysobjectsreduce

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