CodingBat frequencyTable

frequencyTable

Define a function that when passed an ArrayList of Integer objects, returns an ArrayList containing the frequency table. That is a list containing tuples, the first value being the item, and the second its count in the passed list. See the input-output mappings to understand this further.

frequencyTable([10, 70, 20, 90, 70, 70, 20, 70, 20, 20, 20, 90, 20]) → [[10, 1], [70, 4], [20, 6], [90, 2]]
frequencyTable([10, 10, 10, 10, 10]) → [[10, 5]]
frequencyTable([]) → []

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