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Learn frontend performance optimization in JavaScript: bundle size, minification, lazy loading, prefetching, images, Node.js builds, and Core Web Vitals (LCP, INP, CLS).

Learn what a `.npmrc` file is, why it matters in Node.js projects, and how to add and use it correctly for npm configuration, private packages, and custom registries. Step-by-step guide with examples.

Comprehensive comparison of JavaScript string methods: String.prototype.slice(), String.prototype.substring(), and String.prototype.substr(). Learn the differences between slice(), substring(), and substr(), when to use each method, common pitfalls, and best practices with detailed code examples.

Comprehensive comparison of GraphQL vs REST APIs: Learn when to use each, performance implications, real-world examples, and best practices for choosing the right API architecture for your project.

Learn about Jetifier, AndroidX, and how to migrate from Android Support Library to AndroidX. Understand the relationship between these technologies and best practices for migration.