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Vlang, also known as V, is a statically-typed programming language that is designed to be simple and easy to understand. It was created by Alexander Medvednikov and first released in 2019. Vlang aims to provide development speed similar to Python while maintaining the performance of C languages. One of the key features of Vlang is its simplicity; it has fewer keywords than most languages, making it easier for beginners to learn. Despite this simplicity, it still offers powerful functionality such as cross-compilation and hot code reloading. Vlang also prioritizes safety with features like no null values by default, immutable variables by default and built-in bounds checking which helps prevent common errors in coding. Additionally, its memory management system does not use garbage collection but rather frees up memory automatically when objects go out of scope. Another notable feature is its efficiency; programs written in V compile down into machine code resulting in fast execution times comparable with those written in C or Rust. Finally,V supports concurrent programming through integrated support for threading which makes writing multi-threaded applications simpler than many other languages. In summary,V lang combines simplicity,ease-of-use,safety,and high performance,making it an attractive choice for both beginner programmers learning their first language,and experienced developers looking for a more efficient alternative.

Ask the right questions secure the right Vlang talent among an increasingly shrinking pool of talent.

First 20 minutes

General Vlang app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in Vlang application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

How would you install Vlang on a Linux system?

You can install Vlang on a Linux system by cloning the Vlang repository from GitHub using the command 'git clone https://github.com/vlang/v'. After that, you can navigate to the V directory and make the V compiler using the command 'make'.

What are the basic data types in Vlang?

The basic data types in Vlang are int, string, bool, array, map, and struct.

How would you declare a variable in Vlang?

In Vlang, you can declare a variable using the 'mut' keyword followed by the variable name and its value. For example, 'mut x := 5'.

Describe the difference between mutable and immutable variables in Vlang.

In Vlang, variables are immutable by default. This means their values cannot be changed once assigned. However, if you want to change the value of a variable, you can declare it as mutable using the 'mut' keyword.

How would you define a function in Vlang?

In Vlang, you can define a function using the 'fn' keyword followed by the function name, parameters, and body. For example, 'fn add(x int, y int) int { return x + y }'.

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What you’re looking for early on

Does the candidate have a solid understanding of Vlang's syntax and semantics?

Has the candidate demonstrated problem-solving skills?

Is the candidate familiar with the standard library of Vlang?

Can the candidate work well in a team?

Next 20 minutes

Specific Vlang development questions

The next 20 minutes of the interview should focus on the candidate's expertise with specific backend frameworks, their understanding of RESTful APIs, and their experience in handling data storage and retrieval efficiently.

What are the key features of Vlang?

Some key features of Vlang include simplicity, performance, safety, hot code reloading, powerful concurrency model, and C interop.

How would you handle errors in Vlang?

In Vlang, errors are values. You can handle errors using the 'or' keyword followed by the error handling code. For example, 'value := function() or { return error }'.

Describe the difference between arrays and maps in Vlang.

In Vlang, an array is a collection of elements of the same type, whereas a map is a collection of key-value pairs. Arrays are ordered and can be indexed, while maps are unordered.

How would you create a struct in Vlang?

In Vlang, you can create a struct using the 'struct' keyword followed by the struct name and its fields. For example, 'struct User { name string, age int }'.

What are the concurrency features in Vlang?

Vlang provides a powerful concurrency model with features like lightweight threads, channels for communication between threads, and locks for shared data.

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At this point, a skilled Vlang engineer should demonstrate strong problem-solving abilities, proficiency in Vlang programming language, and knowledge of software development methodologies. Red flags include lack of hands-on experience, inability to articulate complex concepts, or unfamiliarity with standard coding practices.

Digging deeper

Code questions

These will help you see the candidate's real-world development capabilities with Vlang.

What does the following simple Vlang code do?
fn main() {
 println('Hello, World!')
}
This code prints 'Hello, World!' to the console.
What will be the output of the following Vlang code?
fn main() {
 a := 10
 b := 20
 println(a + b)
}
The output of the code will be 30. The code assigns 10 to variable 'a' and 20 to variable 'b', then it prints the sum of 'a' and 'b'.
What does the following Vlang code do?
fn main() {
 arr := [1, 2, 3, 4, 5]
 for i in arr { 
 println(i)
 }
}
This code prints all the elements of the array 'arr'. It uses a for loop to iterate over each element in the array and print it to the console.
What does the following Vlang code do?
import sync

fn worker(n int, wg &sync.WaitGroup) {
 defer { wg.done() }
 println('Worker $n')
}

fn main() {
 wg := sync.new_waitgroup()
 for i in 0..10 { wg.add(1) go worker(i, &wg) }
 wg.wait()
}
This code creates 10 worker goroutines and waits for all of them to finish. Each worker prints its ID (from 0 to 9). The 'sync.WaitGroup' is used to wait for all goroutines to finish their execution before the main function returns.

Wrap-up questions

Final candidate for Vlang Developer role questions

The final few questions should evaluate the candidate's teamwork, communication, and problem-solving skills. Additionally, assess their knowledge of microservices architecture, serverless computing, and how they handle Vlang application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

How would you implement inheritance in Vlang?

Vlang does not support inheritance in the traditional sense. It encourages composition over inheritance. However, you can achieve similar functionality using interfaces and structs.

Describe the difference between methods and functions in Vlang.

In Vlang, a function is a standalone block of code that can be called by its name, whereas a method is a function associated with a specific type (struct).

How would you manage memory in Vlang?

Vlang has automatic memory management. It uses a garbage collector to automatically free up memory that is no longer in use. However, you can also manually manage memory using the 'free' function.

Vlang application related

Product Perfect's Vlang development capabilities

Beyond hiring for your Vlang engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in Vlang projects, and can engage in multiple capacities.

Vlang Consultive assessments

Vlang Application Conversion Assessment Vlang Application Integration Assessment Vlang Data & Database Integration Assessment

Custom Vlang development projects

Custom Vlang App Conversion Vlang Custom App Development Process App UI Design for Vlang Facelifts

Hiring guide for Vlang Engineers

Vlang Developer Hiring Guide

What you’re looking for early on

The ideal back-end app developer

What you’re looking to see on the Vlang engineer at this point.

Vlang Consultive assessments

Custom Vlang development projects