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Objective
Write a recursive function to calculate the sum of an array of integers!
__Example__: `[1, 2, 3, 4, 5] = 1 + 2 + 3 + 4 + 5 = 15`
Input: `[1, 2, 3, 4, 5]`
Expected Output: `15`
Hint: Use `.slice()`!
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Sum
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function sum(arr) {
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2 points
Write a recursive function to calculate the sum of an array of integers!
Example: [1, 2, 3, 4, 5] = 1 + 2 + 3 + 4 + 5 = 15
Input: [1, 2, 3, 4, 5]
Expected Output: 15
Hint: Use .slice()!
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