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ECE 421 | Exploring Software Development Domains
1
Assignment 5: Refactoring
Question 1: Consider the following code:
pub struct L{
x: usize,
y: usize,
}
pub fn foo (text: &str, string: &str)-Vec<L {
let mut r= Vec::new();
let mut x=0;
for line in text.lines(){
for (y, _) in line.match_indices(string){
r.push(L{
x : x,
y: y,
})
}
x+=1;
}
r
}
a- What does this program do?
b- Try running the Foo function with the following code and report the output.
let results = foo(“Shall I compare thee to a summer’s day?
Thou art more lovely and more temperate:
Rough winds do shake the darling buds of May,
And summer’s lease hath all too short a date:
Sometimes too hot the eye of heaven shines,
And too often is his gold complexion dimm’d:
And every fair from fair sometimes declines,
By chance or natures changing course untrimm’d;
By thy eternal summer shall not fade,
Nor lose possession of that fair thou owest;
Nor shall Death brag thou wander’st in his shade,
When in eternal lines to time thou growest:
So long as men can breathe or eyes can see,
So long lives this and this gives life to thee.”, “the”);
for x in results {println!(“x : {}, y : {}”, x.x, x.y);}
Question 2: Convert the foo function to the functional style by applying the following refactorings:
a- Apply iterators to replace the need to manually track y at line 9.
b- Use the map function to replace the need to manually update the r vectors.
c- Keep adding iterators until the for loops and let statements (in function foo) disappear.
ECE 421 | Exploring Software Development Domains
2
Question 3: Consider the following code:
use std::collections::HashMap;
#[derive(Debug)]
struct TrieNode {
chs: HashMap<char, TrieNode,
value: Option<i32,
}
#[derive(Debug)]
struct Trie {
root: TrieNode,
}
impl Trie {
fn new() – Trie {
Trie {
root: TrieNode {
chs: HashMap::new(),
value: None,
},
}
}

fn add_string(&mut self, string: String, value: i32) {
let mut current_node = &mut self.root;
for c in string.chars() {
current_node = current_node.chs
.entry(c)
.or_insert(TrieNode {
chs: HashMap::new(),
value: None,
});
}
current_node.value = Some(value);
}
}
fn main() {
let mut trie = Trie::new();
trie.add_string(“B”.to_string(), 1);
trie.add_string(“Bar”.to_string(), 2);
println!(“{:#?}”, trie);
}
The above code implements a Trie (https://docs.rs/radix_trie/0.0.9/radix_trie/struct.Trie.html#method.len)
which is a data-structure for storing and querying string-like keys and associated values.
a- Add your own implementation for length(&self)-usize that returns the number of elements stored
in the trie.
ECE 421 | Exploring Software Development Domains
3
b- Add your own implementation for iter(&self) which returns an iterator over the keys and values of
the Trie.
c- Add your own implementation for find(&self, key: &String) – Option<&TrieNode which
searches the Trie for a given key and returns a reference to that key’s corresponding node if found.
d- Add your own implementation for delete(&mut self, key: &String) – Option<i32 to remove a
key (from a Trie) and returns the value corresponding to that key.

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