How should I practice Mutable Record Store with Error Results?

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Mutable Record Store with Error Results

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Problem statement

Process commands over string records keyed by id:

INSERT id value creates a missing record.
UPDATE id value changes an existing record.
REMOVE id deletes an existing record.
GET id reads an existing value.

Every successful mutation emits OK. A duplicate insert or any missing-id update, remove, or get emits ERROR. GET otherwise emits the value. Return all results in command order.

Function

recordStore(operations: String[]) → String[]

Examples

Example 1

operations = ["INSERT a one","GET a","UPDATE a two","GET a","REMOVE a","GET a"]return = ["OK","one","OK","two","OK","ERROR"]

The record moves through insert, update, removal, and missing read.

Example 2

operations = ["INSERT x 1","INSERT x 2","GET x"]return = ["OK","ERROR","1"]

A duplicate insert does not overwrite.

Example 3

operations = ["UPDATE q 9","REMOVE q"]return = ["ERROR","ERROR"]

Both operations require an existing record.

Constraints

1 <= operations.length <= 10^5.
Ids and values are nonempty strings without spaces.
Commands are valid and use only the four documented operations.