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feat(iterators2): adds iterators2 exercise including config
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Jesse-Cameron committed Jul 3, 2019
1 parent 5e1d7c3 commit 9288fcc
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145 changes: 145 additions & 0 deletions exercises/standard_library_types/iterators2.rs
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// 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()::<String>() + 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<String> = // 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
4 changes: 4 additions & 0 deletions info.toml
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Expand Up @@ -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"
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