Решение на упр.03 задача 3 от Ивайло Иванов

Обратно към всички решения

Към профила на Ивайло Иванов

Код

use std::collections::HashMap;

enum Event {

Login { user: String, timestamp: u64 },

Logout { user: String, timestamp: u64 },

Purchase { user: String, item: String, amount: f64, timestamp: u64 },

Error { code: i32, message: String, timestamp: u64 }

}

struct EventLog { events: Vec<Event>, }

impl EventLog{

fn new() -> EventLog{

EventLog{ events: Vec::new()}

}

fn add_event(&mut self, event: Event){

self.events.push(event);

}

fn user_spent(&self, user: &str) -> f64{

let mut spent_money = 0.;

for event in &self.events{

match event{

Event::Purchase { user: event_user, item: _ , amount , timestamp: _} =>

{

if user.eq(event_user) {spent_money = spent_money + amount}

}

_ => {}

}

}

spent_money

}

fn summaries_by_type(&self) -> HashMap<String, usize>{

let mut map: HashMap<String, usize> = HashMap::new();

for event in &self.events {

let key = match event {

Event::Login { .. } => "Login",

Event::Logout { .. } => "Logout",

Event::Purchase { .. } => "Purchase",

Event::Error { .. } => "Error",

};

*map.entry(key.to_string()).or_insert(0) += 1;

Това го гугълнах да видя как да напрая цялата тази функция без странни проверки. Нямам възможност да посещавам упражнения и разчитам на записите от минали години където все още не съм видял HashMap, така че съжалявам, ако не се придържам към взетите неща на упражненията, кажете, ако е проблем.

Ивайло Иванов коментира преди 4 дена

}

map

}

fn filter_events(&self, user: Option<&str>, after: Option<u64>) -> Vec<&Event> {

let mut result = Vec::new();

for event in &self.events {

let (event_user, timestamp) = match event {

Event::Login { user, timestamp } => (Some(user.as_str()), *timestamp),

Event::Logout { user, timestamp } => (Some(user.as_str()), *timestamp),

Event::Purchase { user, item: _, amount: _, timestamp } => (Some(user.as_str()), *timestamp),

Event::Error { code: _, message: _, timestamp } => (None, *timestamp),

};

let user_ok = match user {

Some(u) => event_user == Some(u),

None => true,

};

let time_ok = match after {

Some(t) => timestamp > t,

None => true,

};

if user_ok && time_ok {

result.push(event);

}

}

result

}

}

Лог от изпълнението

Updating crates.io index
     Locking 17 packages to latest compatible versions
   Compiling proc-macro2 v1.0.103
   Compiling unicode-ident v1.0.22
   Compiling quote v1.0.41
   Compiling futures-sink v0.3.31
   Compiling futures-core v0.3.31
   Compiling futures-channel v0.3.31
   Compiling pin-utils v0.1.0
   Compiling memchr v2.7.6
   Compiling syn v2.0.108
   Compiling slab v0.4.11
   Compiling futures-io v0.3.31
   Compiling futures-task v0.3.31
   Compiling pin-project-lite v0.2.16
   Compiling solution v0.1.0 (/tmp/d20251030-1757769-4050oo/solution)
warning: enum `Event` is never used
 --> src/lib.rs:3:6
  |
3 | enum Event {
  |      ^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: struct `EventLog` is never constructed
  --> src/lib.rs:10:8
   |
10 | struct EventLog { events: Vec<Event>, }
   |        ^^^^^^^^

warning: associated items `new`, `add_event`, `user_spent`, `summaries_by_type`, and `filter_events` are never used
  --> src/lib.rs:13:8
   |
12 | impl EventLog{
   | ------------- associated items in this implementation
13 |     fn new() -> EventLog{
   |        ^^^
...
17 |     fn add_event(&mut self, event: Event){
   |        ^^^^^^^^^
...
21 |     fn user_spent(&self, user: &str) -> f64{
   |        ^^^^^^^^^^
...
36 |     fn summaries_by_type(&self) -> HashMap<String, usize>{
   |        ^^^^^^^^^^^^^^^^^
...
53 |     fn filter_events(&self, user: Option<&str>, after: Option<u64>) -> Vec<&Event> {
   |        ^^^^^^^^^^^^^

warning: `solution` (lib) generated 3 warnings
   Compiling futures-macro v0.3.31
   Compiling futures-util v0.3.31
   Compiling futures-executor v0.3.31
   Compiling futures v0.3.31
    Finished `test` profile [unoptimized + debuginfo] target(s) in 8.53s
     Running tests/solution_test.rs (target/debug/deps/solution_test-bfd50394249726db)

running 2 tests
test solution_test::test_empty ... ok
test solution_test::test_basic ... ok

test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

История (1 версия и 2 коментара)