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Exercise 2

What will the following programs return? What is the value of arr after each?

1. arr = ["b", "a"]
   arr = arr.product(Array(1..3))
   arr.first.delete(arr.first.last)

2. arr = ["b", "a"]
   arr = arr.product([Array(1..3)])
   arr.first.delete(arr.first.last)

Solution

1. returns 1
    arr =  [["b"], ["b", 2], ["b", 3], ["a", 1], ["a", 2], ["a", 3]]

2. returns [1, 2, 3]
    arr = [["b"], ["a", [1, 2, 3]]]

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