inversion of control in FP

[Jignesh Patel]

How we can experience inversion of control in context of functional programming?

[Michał Płachta]

This is a hot topic in this book

In short, you invert the control by passing a function to a function. For example, if you are sorting a list of Book values, you can:

val books: List[Book] = ... books.sortBy(sortFunction)

where sortFunction is a function that takes a Book and returns it's "rating". sortBy doesn't know what the sortFunction does, it just uses it.

[Jignesh Patel]

Michał Płachta wrote:
In short, you invert the control by passing a function to a function.

Interesting thinking!!! Another good reason to purchase the book. As this concept requires a bit of study with the clear head.

[Stephan van Hulst]

I think you have to worry less about IoC in languages that are purely functional, because it comes natural: A pure function always requires you to inject data or dependencies as function parameters. There is no global state.