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 check that blog as well from here.

Let’s start:

forEach

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.

Example:

Output: 1 3 8 5 6

Map

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

compactMap

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 optional.

Example:

Output: [1, 3, 5, 6]

flatMap

flatMap converts a 2D array to a one-dimensional array.

Example:

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

sort(by:)

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

Example:

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

sorted(by:)

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

Example:

Output:

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.

Thanks for reading