Created
May 20, 2019 07:58
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| let contactsDurationArr = contacts.map({ return $0.duration })//We use the map function to derive an array that contains only the duration property of all the objects | |
| var sum = 0 | |
| for duration in contactsDurationArr { | |
| sum = sum + duration | |
| } | |
| print(sum) |
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