X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/342e299d8a8fd79f07960312b73e241c6cc0400e..53b9ab56f7b712e6710fd873d456a0fe1f13b785:/workspace/src/part10.rs diff --git a/workspace/src/part10.rs b/workspace/src/part10.rs index 7af1617..8fc650f 100644 --- a/workspace/src/part10.rs +++ b/workspace/src/part10.rs @@ -1,8 +1,7 @@ // Rust-101, Part 10: Closures // =========================== -use std::io::prelude::*; -use std::{fmt,io}; +use std::fmt; use part05::BigInt; @@ -15,7 +14,7 @@ trait Action { impl BigInt { fn act_v1(&self, mut a: A) { for digit in self { - a.do_action(digit); + unimplemented!() } } } @@ -25,10 +24,10 @@ struct PrintWithString { } impl Action for PrintWithString { - // Here we perform performs the actual printing of the prefix and the digit. We're not making use of our ability to + // Here we perform the actual printing of the prefix and the digit. We're not making use of our ability to // change `self` here, but we could replace the prefix if we wanted. fn do_action(&mut self, digit: u64) { - println!("{}{}", self.prefix, digit); + unimplemented!() } } @@ -52,7 +51,7 @@ impl BigInt { fn act(&self, mut a: A) { for digit in self { // We can call closures as if they were functions - but really, what's happening here is translated to essentially what we wrote above, in `act_v1`. - a(digit); + unimplemented!() } } } @@ -90,10 +89,10 @@ fn print_enumerated(v: &Vec) { // And as a final example, one can also collect all elements of an iterator, and put them, e.g., in a vector. fn filter_vec_by_divisor(v: &Vec, divisor: i32) -> Vec { - v.iter().map(|n| *n).filter(|n| *n % divisor == 0).collect() + unimplemented!() } -// **Exercise 10.1**: Look up the [documentation of `Iterator`](http://doc.rust-lang.org/stable/std/iter/trait.Iterator.html) to learn about more functions +// **Exercise 10.1**: Look up the [documentation of `Iterator`](https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html) to learn about more functions // that can act on iterators. Try using some of them. What about a function that sums the even numbers of an iterator? Or a function that computes the // product of those numbers that sit at odd positions? A function that checks whether a vector contains a certain number? Whether all numbers are // smaller than some threshold? Be creative!