10+ Automotiveis De Cristal Interview Questions and Answers

Event Loop in Node.js is a mechanism that allows Node.js to perform non-blocking I/O operations.

• Event Loop is responsible for handling asynchronous operations in Node.js.

• It allows Node.js to perform multiple operations simultaneously without blocking the execution.

• Event Loop continuously checks the event queue for any pending tasks and executes them in a loop.

• Example: setTimeout() function in Node.js uses Event Loop to schedule the callback function after a specified delay.

Count the number of substrings in a given string that are divisible by 6.

• Iterate through all possible substrings of the given string.

• Check if the substring is a valid integer and not starting with 0.

• If the substring is divisible by 6, increment the count.

• Return the count of substrings that are divisible by 6.

To find the total number without any loop in Node.js

• Use the reduce() method to sum up the values in an array

• Use the length property of an array to get the total number of elements

• Use the Object.keys() method to get the total number of keys in an object

Promises, async/await, and callbacks are all ways to handle asynchronous operations in Node.js.

• Callbacks are functions passed as arguments to another function and called when the operation is complete.

• Promises represent a value that may not be available yet, but will be resolved at some point in the future.

• Async/await is a syntax for writing asynchronous code that looks like synchronous code.

• Callbacks are the oldest and most widely used method, but can lead to callback hell.

• P...read more

SQL query to find the second largest salary in a table

• Use the MAX() function to find the highest salary

• Use the WHERE clause to exclude the highest salary

• Order the salaries in descending order and limit the result to 1

Interfaces in TypeScript are used to define the structure of objects. They provide a way to enforce a certain shape on objects.

• Interfaces allow us to define the structure of an object by specifying the properties and their types.

• Interfaces can be used to enforce a certain shape on objects, ensuring that they have the required properties.

• Interfaces can also be used for type checking and to provide better documentation for the code.

• Example: interface Person { name: string; age:...read more

The output of a PHP program using And and Or depends on the logic used in the program.

• And (&&) returns true if both conditions are true

• Or (||) returns true if at least one condition is true

• The output will depend on the logic used in the program

The query to get the employee with the 3rd maximum salary in MySQL.

• Use the ORDER BY clause to sort the salaries in descending order.

• Use the LIMIT clause to retrieve the third row.

• Use a subquery to select the third maximum salary.

Loader is used to load external assets such as images, sounds, and data into a game or application.

• Load images, sounds, and data from external sources into the game or application

• Improve loading times by preloading assets before they are needed

• Handle loading errors and provide feedback to the user

• Examples: loading character sprites, background music, level data

Understanding of SDLC, risk management, project planning, project manager roles, communication skills, process improvement, and Agile implementation.

• SDLC involves phases like planning, analysis, design, implementation, and maintenance.

• Risk management includes identifying, assessing, and mitigating risks to project success.

• Types of project planning include waterfall, agile, and hybrid approaches.

• Project manager roles involve leadership, communication, planning, and risk manage...read more

Object pooling is a design pattern where a set of objects are created and reused instead of creating new instances.

• Improves performance by reducing memory allocation and deallocation overhead

• Objects are kept in a pool and reused when needed

• Commonly used in game development for frequently created and destroyed objects

I would prioritize the CR based on impact and urgency, communicate with the client to understand their needs, and work with the team to assess feasibility and potential impact on the sprint.

• Prioritize the CR based on impact and urgency

• Communicate with the client to understand their needs and expectations

• Work with the team to assess feasibility and potential impact on the sprint

• Discuss with the team to determine if the CR can be accommodated within the current sprint timeline ...read more

Promises are used in Node to handle asynchronous operations and avoid callback hell.

• Promises simplify error handling and make code more readable.

• Promises allow for chaining multiple asynchronous operations.

• Promises can be used with async/await to write synchronous-looking code.

• Example: fetching data from an API using axios library with promises.

• Example: reading a file with promises in Node's fs module.

JS Prototype is a mechanism for inheritance and sharing properties among objects.

• Prototype is a property of every JavaScript function.

• It allows objects to inherit properties and methods from other objects.

• Modifying the prototype of a function affects all instances of that function.

• Prototype chain is used to look up properties and methods of an object.

• Prototype can be used to add new methods and properties to existing objects.

Sequelize is an ORM for Node.js that supports multiple databases and provides easy data modeling and querying.

• Sequelize is used to interact with databases in Node.js

• It supports multiple databases like MySQL, PostgreSQL, SQLite, etc.

• It provides easy data modeling and querying with its object-relational mapping

• Example: const sequelize = new Sequelize('database', 'username', 'password', { dialect: 'mysql' });