Fabrizio Fortunato izifortune

Category theory jargon cheat sheet

A primer/refresher on the category theory concepts that most commonly crop up in conversations about Scala or FP. (Because it's embarassing when I forget this stuff!)

I'll be assuming Scalaz imports in code samples, and some of the code may be pseudo-Scala.

Functor

A functor is something that supports map.

Converting a Word Document to Markdown in One Move

The Problem

A lot of important government documents are created and saved in Microsoft Word (*.docx). But Microsoft Word is a proprietary format, and it's not really useful for presenting documents on the web. So, I wanted to find a way to convert a .docx file into markdown.

Installing Pandoc

On a mac you can use homebrew by running the command brew install pandoc.

The Solution

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

Comprehensive Introduction to @ngrx/store

By: @BTroncone

Also check out my lesson @ngrx/store in 10 minutes on egghead.io!

Update: Non-middleware examples have been updated to ngrx/store v2. More coming soon!

Table of Contents

How to run nightly version of @ngrx/store along with new @ngrx/effects

Add new packages to your dependencies

Effects and store v2 are not on npm yet, so download them from my github.

"@ngrx/core": "1.0.0",
"@ngrx/store": "fxck/store#v2-test",
"@ngrx/effects": "fxck/effects",

Running nightmare on Amazon Linux

You may have thought of running nightmare on AWS Lambda. But before we can run it on Lambda, we need first to make it run on Amazon Linux.

Provision instance which replicates Lambda environment

According to AWS Documentation on Lambda Execution Environment and available Libraries we would need this AMI image with this alias amzn-ami-hvm-2016.03.3.x86_64-gp2. Keep in mind that AMI-image-id for this instance would be different in different regions (eg):

In eu-west-1 - ami-f9dd458a
In us-east-1 - ami-6869aa05

	# migrating from https://github.com/robbyrussell/oh-my-zsh/blob/master/plugins/git/git.plugin.zsh

	# Aliases
	alias g='git'
	#compdef g=git
	alias gst='git status'
	#compdef _git gst=git-status
	alias gd='git diff'
	#compdef _git gd=git-diff
	alias gdc='git diff --cached'

	/**
	* This short program will encrypt the user password
	* and insert a new record into a mock database.
	*/
	const Reader = require('fantasy-readers');
	const R = require('ramda');
	const crypto = require('crypto');

	// our mock database
	const database = [

	const obj = { a: 1, c: 3, b: 2 }

	// Map from object.
	const myMap = new Map(Object.entries(obj))

	// Map to Object.
	// NOTE: Keys will be cast to strings by `.toString`, so any "complex" key like for example `[1, 2]` will become `1,2`
	const newObj = [...myMap.entries()]
	.reduce((acc, [key, value]) => (Object.assign(acc, { [key]: value })), {})

	nnoremap <silent> <leader>e :call Fzf_dev()<CR>

	" ripgrep
	if executable('rg')
	let $FZF_DEFAULT_COMMAND = 'rg --files --hidden --follow --glob "!.git/*"'
	set grepprg=rg\ --vimgrep
	command! -bang -nargs=* Find call fzf#vim#grep('rg --column --line-number --no-heading --fixed-strings --ignore-case --hidden --follow --glob "!.git/*" --color "always" '.shellescape(<q-args>).'\| tr -d "\017"', 1, <bang>0)
	endif

	" Files + devicons