Consider two input arrays,let listOne = [3,nil,5,7]let listTwo = [4,6,

1.	Consider two input arrays,let listOne = [3,nil,5,7]let listTwo = [4,6,2,8,nil]By using higher order functions, write code snippet to get a sum of all integers from both arrays.
Answer» 35 Higher order functions are simply functions that can either ACCEPT functions or closures as arguments or return a function/closure. Higher Order Functions are very useful and powerful and HELP us to write more elegantly and maintainable code. Those functions are Map, FILTER, Reduce, Sort, CompactMap etc. let result = [listOne.compactMap({ $0}),listTwo.compactMap({ $0})].flatMap({ $0}).reduce(0) { $0 + $1 } First compact map removes nil element from the array. Then by using a flat map, we combine these two arrays. And finally, reduce function will help to get the SUM of array elements.

Consider two input arrays,let listOne = [3,nil,5,7]let listTwo = [4,6,2,8,nil]By using higher order functions, write code snippet to get a sum of all integers from both arrays.

Answer»

Higher order functions are simply functions that can either ACCEPT functions or closures as arguments or return a function/closure.

Higher Order Functions are very useful and powerful and HELP us to write more elegantly and maintainable code. Those functions are Map, FILTER, Reduce, Sort, CompactMap etc.

let result = [listOne.compactMap({ $0}),listTwo.compactMap({ $0})].flatMap({ $0}).reduce(0) { $0 + $1 }

First compact map removes nil element from the array. Then by using a flat map, we combine these two arrays.

And finally, reduce function will help to get the SUM of array elements.

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