From 9288fccf07a2c5043b76d0fd6491e4cf72d76031 Mon Sep 17 00:00:00 2001 From: Jesse Date: Tue, 2 Jul 2019 21:21:58 +1000 Subject: [PATCH] feat(iterators2): adds iterators2 exercise including config --- .../standard_library_types/iterators2.rs | 145 ++++++++++++++++++ info.toml | 4 + 2 files changed, 149 insertions(+) create mode 100644 exercises/standard_library_types/iterators2.rs diff --git a/exercises/standard_library_types/iterators2.rs b/exercises/standard_library_types/iterators2.rs new file mode 100644 index 0000000..d102dc9 --- /dev/null +++ b/exercises/standard_library_types/iterators2.rs @@ -0,0 +1,145 @@ +// iterators2.rs +// In this module, you'll learn some of unique advantages that iterators can offer +// Step 1. Complete the `capitalize_first` function to pass the first two cases +// Step 2. Apply the `capitalize_first` function to a vector of strings, ensuring that it +// Step 3. Apply the `capitalize_first` function again to a list, but try and ensure it returns a single string +// As always, there are hints below! + +pub fn capitalize_first(input: &str) -> String { + let mut c = input.chars(); + match c.next() { + None => String::new(), + Some(first) => first.collect()::() + c.as_str(), + } +} + +#[cfg(test)] +mod tests { + use super::*; + + // Step 1. + // Tests that verify your `capitalize_first` function implementation + #[test] + fn test_success() { + assert_eq!(capitalize_first("hello"), "Hello"); + } + + #[test] + fn test_empty() { + assert_eq!(capitalize_first(""), ""); + } + + // Step 2. + #[test] + fn test_iterate_string_vec() { + let words = vec!["hello", "world"]; + let capitalized_words: Vec = // TODO + assert_eq!(capitalized_words, ["Hello", "World"]); + } + + #[test] + fn test_iterate_into_string() { + let words = vec!["hello", " ", "world"]; + let capitalized_words = // TODO + assert_eq!(capitalized_words, "Hello World"); + } +} + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +// Step 1 +// You need to call something on `first` before it can be collected +// Currently it's type is `char`. Have a look at the methods that are available on that type: +// https://doc.rust-lang.org/std/primitive.char.html + + + + + + + + + + + + + + + + + + + + + + + + + + +// Step 2 +// First you'll need to turn the Vec into an iterator +// Then you'll need to apply your function unto each item in the vector +// P.s. Don't forget to collect() at the end! + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +// Step 3. +// This is very similar to the previous test. The only real change is that you will need to +// alter the type that collect is coerced into. For a bonus you could try doing this with a +// turbofish diff --git a/info.toml b/info.toml index 2eb34ef..6c4f639 100644 --- a/info.toml +++ b/info.toml @@ -210,6 +210,10 @@ mode = "compile" path = "exercises/standard_library_types/arc1.rs" mode = "compile" +[[exercises]] +path = "exercises/standard_library_types/iterators2.rs" +mode = "test" + [[exercises]] path = "exercises/standard_library_types/iterators3.rs" mode = "test"