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Svelte 5 was a ground-up rewrite of Svelte, changing core concepts such as reactivity and reusability. [19] Its primary feature, runes , reworked how reactive state is declared and used. Runes are function-like macros that are used to declare a reactive state, or code that uses reactive states.
Lightweight frameworks, such as Svelte and Preact, take different architectural approaches, with Svelte eliminating the virtual DOM entirely in favor of compiling components to efficient JavaScript code, and Preact offering a minimal, compatible alternative to React.
Svelte does not have a virtual DOM, with its creator Rich Harris calling the virtual DOM "pure overhead". [16] Instead of diffing and reconciling DOM nodes at runtime, Svelte uses compile-time reactivity to analyze markup and generate JavaScript code that directly edits the HTML, drastically increasing performance.
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Each Bootstrap component consists of an HTML structure, CSS declarations, and in some cases accompanying JavaScript code. They also extend the functionality of some existing interface elements, including for example an auto-complete function for input fields. Example of a webpage using Bootstrap framework rendered in Firefox
Vite supports frameworks such as React, Vue, and Svelte, and has server-side rendering (SSR), code-splitting, and asynchronous loading. Vite's production build times are fast compared to traditional build tools, clocking in at 3.37 seconds versus Webpack 's 10.82 seconds and Parcel 's 9.01 seconds.
It supports bundling, minifying, server-side rendering (Svelte, Nuxt.js, Vite). Bundling refers to the process of combining multiple files and assets like JavaScript , CSS , and HTML into a single file, or a smaller number of files, to reduce the number of server requests and enhance performance. [ 7 ]
In this example, two text boxes are bound to observable variables on a data model. The "full name" display is bound to a dependent observable, whose value is computed in terms of the observables. When either text box is edited, the "full name" display is automatically updated, with no explicit event handling.