public/subjects/generics_list/README.md

generics_list

Instructions

Create a linked list of generic values with the following methods.

• new: returns a new empty list.
• push: adds an element to the beginning of the list.
• pop: deletes an element from the list based on LIFO.
• len: returns the size of the list.

Expected Functions

#[derive(Clone, Debug)]
pub struct List<T> {
    pub head: Option<Node<T>>,
}

#[derive(Clone, Debug)]
pub struct Node<T> {
    pub value: T,
    pub next: Option<Box<Node<T>>>,
}

impl<T> List<T> {
    pub fn new() -> List<T> {
    }

    pub fn push(&mut self, value: T) {
    }

    pub fn pop(&mut self) {
    }

    pub fn len(&self) -> usize {
    }
}

Usage

Here is a program to test your function.

use generics_list::*;

fn main() {
    let mut new_list_str = List::new();
    new_list_str.push("String Test 1");
    println!("The size of the list is {}", new_list_str.len());

    new_list_str.push("String Test 2");
    println!("The size of the list is {}", new_list_str.len());

    new_list_str.push("String Test 3");
    println!("The size of the list is {}", new_list_str.len());

    new_list_str.pop();
    println!("The size of the list is {}", new_list_str.len());
}

And its output

$ cargo run
The size of the list is 1
The size of the list is 2
The size of the list is 3
The size of the list is 2
$