Mastering Node.js by answering top interview questions

Demonstrate handling CLI arguments in a Node.js program using process.argv to perform double or modulo operations on input numbers, with clear examples for double and modulo cases.

Learn how to convert a JSON string into a JavaScript object using the built-in JSON.parse method, verify the resulting object type, and understand the distinction between string values and objects.

Examine how the this keyword behaves, access student properties via the object, and fix scope issues in an es6 method by calling the get FullName function on the student object.

Understand how this keyword becomes undefined when a function is called without an object, and fix it by invoking getName on the student object to yield John.

Explore how Node.js global and module.exports interact, and how this in named functions references the global object, demonstrated by nickname and age properties and the H property.

Master the bind method to fix this binding in JavaScript, ensuring this references the correct object in asynchronous calls and when binding dog and teacher examples.

Learn what a callback function is and how it’s passed to another function as an argument and later invoked, demonstrated with a countdown using setTimeout for 3 seconds.

Explore how var, let, and const differ in scope—var uses function scope while let and const use block scope—plus how const cannot be reassigned and common output patterns.

Explore how var, let, and const hoisting affects access before declaration, initialization, and redeclaration, with examples showing undefined versus reference errors.

Explore hoisting with var and let through examples, showing how let triggers reference errors before initialization while var yields undefined, and how scope changes inside versus outside functions.

Compare anonymous (function expressions) and named (function declarations) functions in node.js, and learn hoisting rules: anonymous functions aren't hoisted; named functions are.

Analyze how var and let affect setTimeout output in a for loop, revealing scope rules in asynchronous JavaScript. Strengthen your understanding of timing and variable scope with this code-focused analysis.

Build a basic express server on port 5000 by initializing npm, installing express, and handling a simple get route that returns hi from an express app.

Extend the express server with test, user, and account routes; return an h1 test, log the id from req.query, and ensure numeric path parameters by converting with the plus operator.

Compare server-side rendering and client-side rendering, using Express with EJS to deliver pre-rendered HTML for SEO. Consider scenarios where client-side rendering and React may be preferred for large data.