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Lecture 7: Functional Programming with Closures and Iterators

Reminders

  • Homework 2 was graded -- if you still have questions about your grade that you want me to look into, please let me know and direct me to the GitHub feedback thread!

  • Homework 3 here. Due date delayed to Monday, April 5 (will announce on Piazza)

    • Remember to email before the deadline to use late days (either the 4 freebies or additional late days) -- so that we make sure to delay grading your assignment.

    • Remember to run cargo clippy and cargo fmt

  • Final project team choices also due April 5 -- see Piazza.

Outline of lecture

Closures (March 25)

Closures are functions with a captured set of variables to evaluate them. Closures are very powerful and allow functional programming in Rust using the Fn trait. We will discuss:

  • How to write closures;

  • How to write functions taking functions as arguments;

  • The Fn trait for function types; and

  • The useful impl Trait syntax.

Iterators (April 1)

The Iterator trait is a very powerful feature in Rust that lets you define objects that can be iterated over in a for loop. We will discuss:

  • How to use iterators to write concise, clean code in Rust;

  • How to define iterators for your own data types, using the Iterator and IntoIterator traits.