Yevhen Bobrov yevhen

Interview Questions

Node.js

Q1: What do you mean by Asynchronous API? ☆☆

Answer: All APIs of Node.js library are aynchronous that is non-blocking. It essentially means a Node.js based server never waits for a API to return data. Server moves to next API after calling it and a notification mechanism of Events of Node.js helps server to get response from the previous API call.

Source: tutorialspoint.com

You should not use the Open SSH client that comes with Git for Windows. Instead, Windows 10 has its own implementation of Open SSH that is integrated with the system. To achieve this:

Start the ssh-agent from Windows Services:

Type Services in the Start Menu or Win+R and then type services.msc to launch the Services window;
Find the OpenSSH Authentication Agent in the list and double click on it;
In the OpenSSH Authentication Agent Properties window that appears, choose Automatic from the Startup type: dropdown and click Start from Service status:. Make sure it now says Service status: Running.

Configure Git to use the Windows 10 implementation of OpenSSH by issuing the following command in Powershell:

git config --global core.sshCommand C:/Windows/System32/OpenSSH/ssh.exe

Trace .NET Core Applications on Linux with `strace`

Troubleshooting a running application can be difficult, usually it starts around checking log output and then following through the likely code paths to get an idea of where a failure may occur. In a development environment, you might attach a debugger a step through source, but troubleshooting isn't always that convenient. There are several helpful tools that can assist, but one that gives the most comprehensive view of a running application is strace. With strace you are able to see all of the system calls an application makes to get a detailed understanding of what is going on "under the hood" in order to troubleshoot an issue.

Take a simple "hello world" F# application, the kind you get from dotnet new console -lang F# -n strace-sample". Build it with dotnet build and then launch it with strace to get a trace of all the system calls in a file called trace.log(adjusting for your build output path if on a different framework vers

	/* eslint-disable no-console */
	/* eslint-disable prefer-arrow-callback */

	import expect from 'expect';
	import { createTestClient } from 'apollo-server-testing';
	import ggl from 'graphql-tag';

	import config from '../../../config';

	import { createServer } from '../../../src/server';

	open System
	open System.Threading
	open Akkling
	open DemoFs

	[<EntryPoint>]
	let main argv =

	let config = """
	akka.loglevel = DEBUG

	"""
	This gist shows how to run asyncio loop in a separate thread.
	It could be useful if you want to mix sync and async code together.
	Python 3.7+
	"""
	import asyncio
	from datetime import datetime
	from threading import Thread
	from typing import Tuple, List, Iterable

	public sealed class Tracer {

	int _traceId;

	readonly Func<long> _clock;
	StreamWriter _writer;

	public Tracer(Func<long> clock) {
	_clock = clock;

	#!groovy

	pipeline {
	agent any

	stages {
	stage('Checkout') {
	steps {
	checkout scm
	}

	#!/usr/bin/env groovy
	// https://github.com/freebsd/freebsd-ci/blob/master/scripts/build/build-test.groovy
	// http://stackoverflow.com/a/40294220

	// https://JENKINS_HOST/scriptApproval/ - for script approval

	import java.util.Date

	def isMaster = env.BRANCH_NAME == 'master'
	def isDevelop = env.BRANCH_NAME == 'develop'

	using Microsoft.AspNet.Mvc.ApplicationModels;
	using Microsoft.AspNet.Mvc.ModelBinding;
	using System;

	namespace Foo.Web.Infrastructure.Conventions
	{
	public class ComplexTypeConvention : IActionModelConvention
	{
	public void Apply(ActionModel action)
	{

Yevhen Bobrov yevhen

Interview Questions

Node.js

Q1: What do you mean by Asynchronous API? ☆☆

Trace .NET Core Applications on Linux with strace

Trace .NET Core Applications on Linux with `strace`