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Custom cache

Generic function

julia> const fib_cache = Dict()
Dict{Any,Any} with 0 entries

julia> _fib(n) = n < 3 ? 1 : fib(n-1) + fib(n-2)
_fib (generic function with 1 method)

This notes is written by Sheldon. You can find me with #iOSBySheldon in Github, Youtube, Facebook, etc.

Need

Convert .mov/.MP4 to .gif

Reason

As a developer, I feel better to upload a short video when I create the pull request to show other viewers what I did in this PR. I tried .mov format directly got after finishing recording screen using Quicktime, however, gif offers preview in most web pages, and has smaller file size.

This is not limited to developer, anyone has this need can use this method to convert the files.

A bunch of good git tutorials

Intro to git

Simplest intro to git by github and codeschool - Try Git
PeepCode Git Internals PDF
[Intro to github]

	library(tidycensus)
	library(ggiraph)
	library(tidyverse)
	library(patchwork)

	vt_income <- get_acs(
	geography = "county",
	variables = "B19013_001",
	state = "VT",
	year = 2019,

	library(shiny)
	library(DT)
	library(dplyr)

	ui <- basicPage(
	DT::dataTableOutput("table")
	)

	server <- function(input, output, session) {
	output$table <- DT::renderDataTable({

	# Repeat an operation n times, e.g.
	# @dotimes 100 println("hi")

	macro dotimes(n, body)
	quote
	for i = 1:$(esc(n))
	$(esc(body))
	end
	end
	end