fix: update iterator and macro text for typos and clarity
- /macros/README.md: Typo "modules" => "macros" - iterators2.py: Reduce line length to <90-char width. - iterators4.py: Update 'fun' => 'challenge' as per PR#177 - rustlings hint iterators4: improve clarity
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Rust's macro system is very powerful, but also kind of difficult to wrap your
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Rust's macro system is very powerful, but also kind of difficult to wrap your
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head around. We're not going to teach you how to write your own fully-featured
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head around. We're not going to teach you how to write your own fully-featured
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modules, instead we'll show you how to use and create them.
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macros. Instead, we'll show you how to use and create them.
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#### Book Sections
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#### Book Sections
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// iterators2.rs
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// iterators2.rs
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// In this module, you'll learn some of unique advantages that iterators can offer
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// In this module, you'll learn some of unique advantages that iterators can offer.
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// Step 1. Complete the `capitalize_first` function to pass the first two cases
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// Step 1. Complete the `capitalize_first` function to pass the first two cases.
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// Step 2. Apply the `capitalize_first` function to a vector of strings, ensuring that it returns a vector of strings as well
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// Step 2. Apply the `capitalize_first` function to a vector of strings.
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// Step 3. Apply the `capitalize_first` function again to a list, but try and ensure it returns a single string
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// Ensure that it returns a vector of strings as well.
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// Step 3. Apply the `capitalize_first` function again to a list.
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// Try to ensure it returns a single string.
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// As always, there are hints if you execute `rustlings hint iterators2`!
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// As always, there are hints if you execute `rustlings hint iterators2`!
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// I AM NOT DONE
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// I AM NOT DONE
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// I AM NOT DONE
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// I AM NOT DONE
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pub fn factorial(num: u64) -> u64 {
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pub fn factorial(num: u64) -> u64 {
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// Complete this function to return factorial of num
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// Complete this function to return the factorial of num
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// Do not use:
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// Do not use:
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// - return
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// - return
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// For extra fun don't use:
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// Try not to use:
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// - imperative style loops (for, while)
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// - imperative style loops (for, while)
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// - additional variables
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// - additional variables
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// For the most fun don't use:
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// For an extra challenge, don't use:
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// - recursion
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// - recursion
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// Execute `rustlings hint iterators4` for hints.
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// Execute `rustlings hint iterators4` for hints.
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}
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}
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@ -640,10 +640,10 @@ name = "iterators4"
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path = "exercises/standard_library_types/iterators4.rs"
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path = "exercises/standard_library_types/iterators4.rs"
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mode = "test"
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mode = "test"
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hint = """
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hint = """
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In an imperative language you might write a for loop to iterate through
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In an imperative language, you might write a for loop that updates
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multiply the values into a mutable variable. Or you might write code more
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a mutable variable. Or, you might write code utilizing recursion
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functionally with recursion and a match clause. But you can also use ranges
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and a match clause. In Rust you can take another functional
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and iterators to solve this in rust."""
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approach, computing the factorial elegantly with ranges and iterators."""
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# TRAITS
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# TRAITS
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