ByteDance frontend engineer interviews emphasise JavaScript, DOM manipulation, CSS, accessibility, browser APIs, and UI component architecture.
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system design
Senior
api design
#1
1. [System Design] Client-side Router — Design an Efficient Client-side Routing System for ByteDance
As ByteDance seeks to improve user experience in its single-page applications (SPAs), it requires a client-side router that efficiently handles navigation and resolves dynamic paths. Your task is to design a lightweight routing system capable of lazy loading components.
Example 1:
Input:
Output: Navigates to home and renders
- The
- Components can be asynchronously loaded.
javascript
class ClientRouter {
addRoute(path: string, component: Function): void;
navigate(path: string): void;
getCurrentRoute(): string;
}
Example 1:
Input:
router.addRoute('/home', HomeComponent); router.navigate('/home');Output: Navigates to home and renders
HomeComponent.Constraints:- The
path should be unique for every route.- Components can be asynchronously loaded.
system design
Senior
api design
#2
2. [System Design] Virtual DOM — Design a Lightweight Virtual DOM for ByteDance
With ByteDance's applications needing lightweight component re-renders, you are tasked to design a lightweight Virtual DOM to optimize UI updates in high-frequency rendering scenarios.
Example 1:
Input:
Output: Updates the DOM to show 'Hello' inside a div with an id 'container'.Constraints:
- The
-
javascript
class VirtualDOM {
createElement(type: string, props: object, ...children: any[]): VNode;
render(vnode: VNode, container: DOMNode): void;
update(oldVNode: VNode, newVNode: VNode): void;
}
Example 1:
Input:
const vnode = virtualDOM.createElement('div', {id: 'container'}, 'Hello');
virtualDOM.render(vnode, document.getElementById('app'));Output: Updates the DOM to show 'Hello' inside a div with an id 'container'.Constraints:
- The
props object can contain various properties, including event listeners.-
children can be a mix of strings and VNode objects.Related ByteDance Frontend Engineer interview prep
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