Treez Interview Questions and Answers

Debugging memory leaks involves identifying and fixing areas where memory is not properly released after use.

• Use tools like Valgrind or AddressSanitizer to detect memory leaks in your application.

• Check for unfreed memory allocations, such as 'malloc' or 'new' without corresponding 'free' or 'delete'.

• Review your code for circular references in data structures, which can prevent memory from being released.

• Implement ...read more

EventEmitter is a class in Node.js that allows multiple functions to be attached to an event and triggered when the event is emitted.

• EventEmitter is a core module in Node.js that allows communication between objects in a loosely coupled way.

• It is used for handling events in Node.js applications.

• Listeners can be attached to EventEmitter instances using the 'on' method and events can be emitted using the 'emit' meth...read more

No, you cannot declare a variable with the same name using var keyword.

• Variables declared with var keyword can only be declared once within the same scope

• Attempting to declare a variable with the same name using var will result in a syntax error

A Promise is an object representing the eventual completion or failure of an asynchronous operation.

• Promises have three states: pending, fulfilled, and rejected.

• A fulfilled promise returns a value, while a rejected promise returns an error.

• Example: const myPromise = new Promise((resolve, reject) => { /* async operation */ });

• You can handle results using .then() for fulfilled and .catch() for rejected promises.

• E...read more

let, var, and const are all used to declare variables in JavaScript, but they have different scopes and behaviors.

• let: block-scoped variable, can be reassigned

• var: function-scoped variable, can be reassigned

• const: block-scoped variable, cannot be reassigned, but its properties can be modified

Callback is a function passed as an argument to another function to be executed later. Async await is a syntax for writing asynchronous code in a synchronous manner.

• Callback is used in event handling, asynchronous programming, and more.

• Async await is a modern way to write asynchronous code in a synchronous style.

• Example: Callback - setTimeout function in JavaScript.

• Example: Async await - fetching data from an API ...read more