Mode:
Duration:
1
Coding works best on desktop or with an external keyboard.
Component with Timer - Yew Typing CST Test
Component with Timer — Yew Code
Updates state every second using IntervalService.
# yew/demo/timer.rs
use yew::prelude::*;
use gloo_timers::callback::Interval;
struct Model {
current_time: String,
}
impl Component for Model {
type Message = ();
type Properties = ();
fn create(ctx: &Context<Self>) -> Self {
let model = Model { current_time: "".into() };
let link = ctx.link().clone();
Interval::new(1000, move || link.send_message(())).forget();
model
}
fn update(&mut self, ctx: &Context<Self>, _msg: Self::Message) -> bool {
self.current_time = js_sys::Date::new_0().to_locale_time_string("en-US");
true
}
fn view(&self, ctx: &Context<Self>) -> Html {
html! { <p>{ &self.current_time }</p> }
}
}
fn main() {
yew::start_app::<Model>();
}Yew Language Guide
Yew is a modern Rust framework for building client-side web applications using WebAssembly (Wasm), providing a reactive component-based architecture similar to React.
Primary Use Cases
- ▸Single-page applications (SPA) in Rust
- ▸Interactive dashboards and data visualization
- ▸WebAssembly-based web games
- ▸Frontend for Rust backend services
- ▸High-performance, low-latency web UIs
Notable Features
- ▸Component-based architecture with reusable components
- ▸Supports reactive updates via message passing
- ▸Virtual DOM for efficient rendering
- ▸WebAssembly backend for fast execution
- ▸Strong Rust type system ensures memory safety
Origin & Creator
Yew was created by Denis Kolodin in 2018 and has since evolved with community contributions into a robust Rust frontend framework.
Industrial Note
Yew is targeted at developers seeking high-performance web applications leveraging Rust's safety, concurrency, and memory efficiency while running in the browser.
Quick Explain
- ▸Yew allows developers to write web frontends in Rust, compiling to WebAssembly for high-performance execution in browsers.
- ▸It supports a component-based model with properties, messages, and lifecycle hooks.
- ▸Includes a virtual DOM for efficient UI updates and re-rendering.
- ▸Integrates with web APIs such as fetch, WebSockets, and local storage.
- ▸Ideal for building fast, type-safe web applications without relying on JavaScript.
Core Features
- ▸HTML-like macro syntax for building UI (`html!`) in Rust
- ▸Message-based component communication
- ▸Properties (props) for component configuration
- ▸Lifecycle hooks (create, update, change, destroy)
- ▸Integration with browser APIs and JS interop
Learning Path
- ▸Learn Rust basics
- ▸Understand WebAssembly concepts
- ▸Install wasm-pack and Trunk
- ▸Build simple Yew components and SPAs
- ▸Integrate async fetch and browser APIs
Practical Examples
- ▸Todo list SPA in Rust/Wasm
- ▸Interactive charting dashboard with async data fetch
- ▸WebAssembly game with user input handling
- ▸CRUD frontend for a Rust backend service
- ▸WebSocket-based realtime chat application
Comparisons
- ▸Yew vs React: Rust/Wasm vs JavaScript, stronger type safety and performance
- ▸Yew vs Svelte: Component-based UI, but compiled to Wasm vs JS
- ▸Yew vs Angular: Yew is Rust-focused, Angular is full-featured JS framework
- ▸Yew vs Seed: Both Rust/Wasm frameworks, Yew has larger ecosystem
- ▸Yew vs Vanilla JS: Type-safe Rust with virtual DOM vs JS direct DOM manipulation
Strengths
- ▸Memory safety guaranteed by Rust compiler
- ▸High-performance UI rendering via WebAssembly
- ▸Strong type checking and compile-time guarantees
- ▸Reactive programming model similar to React
- ▸Can interoperate with existing JS libraries via wasm-bindgen
Limitations
- ▸Compile times can be long for large projects
- ▸WebAssembly startup overhead may impact first-load time
- ▸Smaller ecosystem compared to JavaScript frameworks
- ▸Browser debugging is more complex than JS frameworks
- ▸Limited third-party component libraries compared to JS
When NOT to Use
- ▸Simple static websites (overkill for small apps)
- ▸Projects heavily dependent on JS ecosystem libraries
- ▸Tiny apps where Rust toolchain setup is too heavy
- ▸Applications requiring server-side rendering out-of-the-box
- ▸Rapid prototyping where JS frameworks are faster
Cheat Sheet
- ▸html! { } -> Render HTML template in component
- ▸Component struct -> define UI logic and state
- ▸Msg enum -> define messages for component updates
- ▸Link<Msg> -> send messages to component
- ▸use_effect / use_state -> hooks for state and effects
FAQ
- ▸Can Yew replace JavaScript frameworks?
- ▸Yes, for Rust developers, especially for performance-critical apps.
- ▸Do I need Rust knowledge to use Yew?
- ▸Yes - Rust basics are required.
- ▸Can Yew work with existing JS libraries?
- ▸Yes - via wasm-bindgen interop.
- ▸Does Yew support routing?
- ▸Yes - using Yew Router crate.
- ▸Is Yew production-ready?
- ▸Yes - used in many Rust/Wasm production projects.
30-Day Skill Plan
- ▸Week 1: Rust fundamentals and ownership model
- ▸Week 2: WebAssembly basics and compiling Rust to Wasm
- ▸Week 3: Build basic Yew components
- ▸Week 4: Handle async requests and complex state
- ▸Week 5: Optimize performance and memory usage in Wasm
Final Summary
- ▸Yew is a Rust framework for building web apps with WebAssembly.
- ▸It offers component-based reactive programming with virtual DOM.
- ▸High performance, memory safety, and Rust type system benefits.
- ▸Integrates with browser APIs and supports async operations.
- ▸Ideal for Rust developers building SPAs, dashboards, or high-performance web apps.
Project Structure
- ▸src/ - main Rust source code
- ▸Cargo.toml - project dependencies and metadata
- ▸index.html - root HTML page
- ▸static/ - static assets (images, CSS)
- ▸tests/ - unit and integration tests
Monetization
- ▸High-performance frontend for SaaS apps
- ▸WebAssembly games or interactive content
- ▸Dashboards for analytics platforms
- ▸Browser-based tools with Rust safety
- ▸Web apps with low-latency and memory efficiency
Productivity Tips
- ▸Use component modularity to simplify maintenance
- ▸Leverage Rust compiler for early bug detection
- ▸Optimize virtual DOM updates
- ▸Use wasm-bindgen efficiently for JS interop
- ▸Minimize Wasm bundle size for faster load
Basic Concepts
- ▸Component - reusable UI unit
- ▸Message - triggers updates inside components
- ▸Props - component input properties
- ▸Virtual DOM - efficient UI rendering
- ▸Lifecycle hooks - component creation, update, and destruction