Leandro Fernandes leandromoh

How to find F# jobs

People often ask me how to find F# jobs. I don't have any special connections to companies using F#, and I don't have any special tricks either. I wish I did!

So, given that, here's my take on F# jobs.

Job hunting

For job hunting my suggestions are:

Tips on exposing F# to C#

Api and Methods

I suggest that you create one or more Api.fs files to expose F# code in a C# friendly way.

In this file:

Define functions with PascalCase names. They will appear to C# as static methods.
Functions should use tuple-style declarations (like C#) rather than F#-style params with spaces.

I thought I'd share some simple steps you can follow if you wan't to build, run and debug an F# program on OSX using dotnet core 2.0. I guess these steps would also work if you're running Linux, with some minor modifications.

Install dotnet sdk for OSX: https://www.microsoft.com/net/learn/get-started/macos
Install Visual Studio Code for OSX: https://code.visualstudio.com/
Install C# (yes, C#) extension for OSX: https://code.visualstudio.com/docs/languages/csharp
Create a new console application project using dotnet cli: dotnet new console -lang F# -n HelloWorld

How to Generate & Use Private Keys using OpenSSL's Command Line Tool

These commands generate and use private keys in unencrypted binary (not Base64 “PEM”) PKCS#8 format. The PKCS#8 format is used here because it is the most interoperable format when dealing with software that isn't based on OpenSSL.

OpenSSL has a variety of commands that can be used to operate on private key files, some of which are specific to RSA (e.g. openssl rsa and openssl genrsa) or which have other limitations. Here we always use

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

	using System;
	using System.Collections.Concurrent;
	using System.Collections.Generic;
	using System.Linq;
	using System.Reflection;
	using System.Reflection.Emit;

	namespace Playground
	{
	public class Program

	using System;
	using MongoDB.Bson;
	using MongoDB.Driver;
	using System.Threading.Tasks;
	using System.Linq;

	/* Where document structure stored in localhost MongoDB : {token:"word"}
	*/

	namespace Aggregation_01

	Add-Type -AssemblyName System.Windows.Forms

	while ($true)
	{
	$Pos = [System.Windows.Forms.Cursor]::Position
	$x = ($pos.X % 500) + 1
	$y = ($pos.Y % 500) + 1
	[System.Windows.Forms.Cursor]::Position = New-Object System.Drawing.Point($x, $y)
	Start-Sleep -Seconds 10
	}