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The content covers the three basics of HTML/CSS/JS/TS, modular development, mainstream frameworks (Vue, React, Angular, Svelte), build tools, browser plug-in development, Node.js backend practice, Next.js/Nest.js and other popular technologies.
Creating a reusable component library in Vue.js is key to improving code reusability and maintainability. Below are design patterns and examples demonstrating how to build reusable Vue components. 1. Single File Component (SFC) Vue.js components are ...
Progressive Web Apps (PWAs) utilize offline storage strategies to provide an offline experience, enabling access to some content even when the network is unavailable. The two primary offline storage t
WebGL (Web Graphics Library) is a JavaScript API that enables hardware-accelerated 3D graphics rendering in any compatible web browser without the need for plugins. Based on the OpenGL standard, it in
Deno, as a modern alternative to Node.js, offers numerous improvements and innovations, particularly in security, module systems, and developer experience. Although still in development, Deno is a com
React Query is a powerful state management library designed for handling data fetching, caching, and updating, particularly suited for API interactions. It offers advanced features such as automatic caching, offline state management, data expiration,...
Generics In TypeScript, generics are a powerful tool that allow us to write reusable components capable of adapting to multiple types. 1. Generic Constraints Generics can be constrained to a specific type or interface, ensuring that the types passed ...
Angular Ivy, introduced as the default rendering engine in Angular 9 and later, replaces the previous View Engine. Ivy aims to improve Angular’s performance, reduce bundle sizes, and enhance developer productivity.
Ivy employs earlier Ahead-of-Time (AOT) compilation, converting templates into pure JavaScript during the build process, reducing runtime compilation overhead. Unlike View Engine, which generated large metadata files, Ivy inlines metadata directly into component classes, decreasing load times.
Ivy produces smaller code due to its compact metadata format and support for finer-grained lazy-loaded module splitting. This ensures users download only the code they need, not the entire application.
Ivy’s metadata structure and optimized compilation process result in faster application startup. The new metadata format reduces parsing and initialization time.
Ivy provides improved type checking during the build phase, catching more errors at compile time rather than runtime. This boosts development efficiency and reduces potential runtime issues.
Ivy allows library authors to use Ivy compilation directly without additional configuration, simplifying library creation and maintenance while benefiting library users.
Ivy enhances support for dynamic components, reducing the overhead of creating and destroying them, a significant performance boost for applications with frequent component lifecycle changes.
Ivy’s dependency injection system is more efficient, minimizing the overhead of dependency lookup, especially in large applications.
Tree shaking, a feature of modern JavaScript bundlers, removes unused code. Ivy’s design makes tree shaking more effective, further reducing final bundle sizes.
To enable Ivy, no special configuration is typically needed in Angular 9 and above, as it’s the default. However, you can manually enable or disable it in the angular.json or tsconfig.app.json file:
{
"compilerOptions": {
"enableIvy": true
}
}
Ivy introduces local scoping for modules and directives, allowing components to declare their own directives or pipes without polluting the global namespace. This reduces potential conflicts and improves code organization and maintainability.
Ivy optimizes change detection, precisely tracking which components need updates. It introduces the “Incremental DOM Builder,” updating only parts of the DOM where data has changed, reducing unnecessary operations and boosting performance.
The Angular team continuously refines Ivy, reducing runtime code, improving data binding, and enhancing startup and runtime performance.
Here’s a simple Angular component example showcasing Ivy’s features:
// app.component.ts
import { Component } from '@angular/core';
@Component({
selector: 'app-root',
template: `
<h1>{{ title }}</h1>
<button (click)="changeTitle()">Change Title</button>
`,
styles: []
})
export class AppComponent {
title = 'Angular Ivy App';
changeTitle() {
this.title = 'New Title';
}
}
In this code, Ivy’s AOT compilation converts the template into efficient JavaScript, minimizing runtime parsing. The change detection mechanism monitors the title property, updating the view only when changeTitle() modifies it.
Ivy enables tree shaking for services, excluding unused service code from the final bundle. This is achieved using the @Injectable({ providedIn: 'root' }) decorator, which provides the service at the root level while allowing tree shakers to identify unused services.
Ivy supports fine-grained lazy loading and preloading, crucial for large applications. Lazy loading loads modules on-demand when users navigate to specific routes, reducing initial load time. Preloading loads modules in the background to improve user experience.
Lazy loading in Angular is straightforward with the Router:
// app-routing.module.ts
import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { HomeComponent } from './home/home.component';
const routes: Routes = [
{ path: '', component: HomeComponent },
{ path: 'about', loadChildren: () => import('./about/about.module').then(m => m.AboutModule) }, // Lazy load About module
];
@NgModule({
imports: [RouterModule.forRoot(routes)],
exports: [RouterModule]
})
export class AppRoutingModule { }
Preloading can be configured using the preloadingStrategy option, with PreloadAllModules to preload all lazy-loaded modules:
// main.ts or app.module.ts
import { BrowserModule } from '@angular/platform-browser';
import { NgModule, PreloadAllModules } from '@angular/core';
import { RouterModule } from '@angular/router';
import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
RouterModule.forRoot(AppRoutingModule.routes, { preloadingStrategy: PreloadAllModules }) // Preload all modules
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
Ivy supports Angular Elements, allowing Angular components to be packaged as Web Components for use in any platform supporting Web Component standards, including non-Angular apps, enhancing reusability and cross-framework compatibility.
Angular offers tools like Angular DevTools to analyze change detection, memory allocation, and rendering performance. Ivy’s improvements provide more accurate and detailed performance data for diagnostics and optimization.
Ivy enhances i18n support with flexible tagging and extraction mechanisms, streamlining multilingual app development and maintenance. Developers can use the ng xi18n command to extract translation tags and leverage tools or services for translations.