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Swift Functional Programming - Second Edition by Dr. Fatih Nayebi

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The flatten function in terms of reduce

And finally, let's implement the flatten function in terms of reduce:

func flattenIntermsOfReduce<Element>(elements: [[Element]]) -> [Element] {     return elements.reduce([]) { $0 + $1 } } let flattened = flattenIntermsOfReduce(elements: aTwoDimArrayOfNumbers) 

flattened will be [1, 3, 5, 2, 4, 6].

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