Counter

Implementation of a counter.

Counter:__init()

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Constructor.

Counter:add(key, count)

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Increments the count for a key.

Arguments:

• key (any): key to increment count for.
• count (int): how much to increment count by.

Returns:

• (int) the new count

Counter:get(key)

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Arguments:

• key (any): key to return count for.

Returns:

• (int) the count for the key

If key has not been added to the counter, then returns 0.

Counter:reset()

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Clears the counter.

Returns:

• (Counter) the modified counter