#2620: Counter

Back again with the second problem in the 30 Days challenge, #2620.

Process

The instructions read as follows.

Given an integer n, return a counter function. This counter function initially returns n and then returns 1 more than the previous value every subsequent time it is called (n, n + 1, n + 2, etc).

Here's the unit tests, if you're curious about the return values.

const counter = createCounter(10)
counter() …

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