Higher-Order Functions in Swift


As we have checked in our previous blog, we learned about some higher-order functions in swift.

In this blog, we are going to explore more Higher-Order functions in swift.

If you have not read our previous blog, please do check that blog as well from here.

Let’s start:


forEach will iterate through all elements in an array. And unlike for in you can’t use a break and continue statement to exit from the closure for forEach.


Output: 1 3 8 5 6


As in our previos blog we have already learned about map, in this blog we will understand the types of map, i.e. compactMap and flatMap


The compactMap(_:) will iterate through all elements in an array and will remove nil values from the input array. It’s basically used when we are working with optionals.


Output: [1, 3, 5, 6]


flatMap converts 2D array to one-dimensional array.


Output: [1, 2, 3, 4, 5, 6, 7, 8, 9]


sort(by:) will sort all elements according to the condition written inside the body of the closure in the same array.


Output: [8, 6, 5, 3 ,1]


sorted(by:) will sort all elements according to the condition written inside the body of the closure and returns a new array.



numbers: [1, 3, 8, 5, 6]

sortedArray: [8, 6, 5, 3 ,1]

For more understanding of higher-order functions please check here.

For more interesting blogs check out here – https://mobikul.com/blog/.

Thanks for reading 🙂

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Hussein Zawia

Hussein Zawia

Co-founder, 24Dokan

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