Full-Stack Developer preguntas y respuestas de entrevista
Pregunta 56. Explain the concept of WebAssembly and its role in web development.
WebAssembly (Wasm) is a binary instruction format that enables high-performance execution of code on web browsers. It allows running languages other than JavaScript in the browser for performance-critical tasks.
Pregunta 57. What is the purpose of the 'map' function in JavaScript, and provide an example of its usage.
The 'map' function in JavaScript is used to transform each element of an array and create a new array with the results. Example: `const numbers = [1, 2, 3]; const doubled = numbers.map(num => num * 2);`
Pregunta 58. Explain the concept of server-side caching and its impact on web application performance.
Server-side caching involves storing copies of dynamically generated content on the server to reduce the need for repeated processing. It improves performance by delivering cached content instead of regenerating it for each request.
Pregunta 59. What is the purpose of the 'Cross-Origin Opener Policy' (COOP) in web security?
COOP is a security feature that controls how documents from different origins can interact. It helps prevent security vulnerabilities by isolating documents from different origins in a browsing context.
Pregunta 60. Explain the concept of GraphQL subscriptions and how they differ from queries and mutations.
GraphQL subscriptions enable real-time data updates by establishing a persistent connection between the client and server. They differ from queries and mutations, which are used for fetching and modifying data, respectively.
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