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cumulative

Language/Type: JavaScript arrays

Write a function named cumulative that accepts as a parameter an array of numbers, and modifies it so that each element contains the cumulative sum of the elements up through that index. For example, if the array passed contains [1, 1, 2.5, 3, 5], your function should modify it to store [1, 2, 4.5, 7.5, 12.5].

You may assume the array passed is non-null and contains only numbers.

Function: Write a JavaScript function as described, not a complete program.

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