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C# Basics

Setup | C# vs .Net | Hello world syntax | Data types | Variables | If statement | Switch statement | Loops | Functions | Function Parameters | Arrays

Notes from http://csharp.net-tutorials.com/

SETUP

INSTALLATION:

1. Install Visual Studio, .NET SDK and C# extension for Visual Studio - https://docs.microsoft.com/en-us/dotnet/core/tutorials/with-visual-studio-code.

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Testing user command line input in RSpec.

This note aims at explaining how to test user input in RSpec.

Background

I'm building a Tic-Tac-Toe game in Ruby. Before the game starts, I need to ask the user for name, in what mode (player vs player, player vs computer) he/she wants to play, and for the sign (eg. X or O). In order to test it, I've stubbed the gets method. It means that each time there was a gets.chomp in the code, I've stubbed it in the test in order to pass an user input. This allowed me to fluently run the tests, without the need of passing user input manually.

Examples of code

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Sort_by ruby method - sorting using multiple attributes.

I guess everyone knows that feeling when you struggle with a codewars kata, create (or even not!) a looong solution, then you check the solutions of of others and go whaaaaaaaat -- they did it in one line?

This is how I felt today and this is how I refreshed my memory of Ruby's sort_by method.

Task:

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React / TS - thinks that I've recentry learned / refreshed

Table of Contents

Easy Section

• Calling an onClick method with an argument

• Object property value shorthand

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Closure in JavaScript

With every fancy framework and even fancier plugin to it, JavaScript is getting easier to use - more things happening behing the scenes, less difficult algorithms and procedures to write by hand. However, every now and then in the troublefree world of frameworks and libraries one might encounter an unexpected problem and then the JavaScript rules will creep out of the shadows and there will be no other other option but to finally face them.

In this entry, I'll go back to JavaScript basics to explain one of the fundamental concepts - a closure. I'll start with explaining the documention on very simple examples and then I'll move on to two more practical use cases.

Cracking the documentation code

Let's start talking about the closure from looking at the definition from documentation:

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from flask_sqlalchemy import SQLAlchemy

db = SQLAlchemy()

class Contact(db.Model):

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(80), unique=True)

    def __init__(self, name):

Kotauror

1. Connect to the ec2 instance: eb ssh name-of-instance --profile name-of-profile (as in the .ssh file)
2. docker ps - to list the dockers
3. take a name of docker container
4. docker exec -it name-of-container /bin/bash
5. cd craft/storage/logs.

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When and how to use interfaces in typescript. TL;DR - to prepare tymplates for objects.

Simple function, not many parameters - interface not needed:

let drawPoint = (x, y) => {
  console.log("kotek")
}

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srand in RSPEC stubbing.

Without further ado - some thoughts on how to use srand in RSPEC testing. Example at the end.

How does the srand work line by line.

Line	Input	Output
1	srand(4)	281462327676453734791076087004180619592

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This note explains how I've solved a problem with building Erlang 21.0.

I used to use evm for managing versions of Erlang. After I've installed Erlang 21.0, I've tried to run mix and this gave me the following error: ** (MatchError) no match of right hand side value: {:error, {:crypto, {'no such file or directory', 'crypto.app'}}}.

I've then decided to use kerl instead of evm because of bigger online support. However, kerl gave me errors when I was trying to build Erlang 21.0 (kerl build 21.0 21.0).

The core of the problem with building Erlang 21.0 was hardcoding the version 20.0 of Erlang into my $PATH. I used to have this: