♚ Pierre-Henry♛ - pH⑦ pH-7

Install Postgres 14

First, make sure you have homebrew installed.

Then, in your terminal, run brew install postgresql@14.9

Login into psql postgres

start/stop postgres

Install Python 2.7 on Mac OS

You will need to have Python 2.7 (and not v3 to avoid incompatibilities with some libraries). To check what’s your default Python version, type python -V in your terminal.

brew install pyenv
pyenv install 2.7.18
pyenv global 2.7.18 # set Python 2.7 as the global default one

`library` VS `require` in R

When loading a library, always use `library`. Never use `require`

TL;DR: require breaks one of the fundamental rules of robust software systems, fail early.

In a nutshell, this is because, when using require, your code might yield different, erroneous results without signalling an error. This is rare, but not hypothetical! Note that require returns the boolean TRUE if the package is successfully loaded, and FALSE if it is not.

On the other hand, require does install the package if it hasn’t been installed (whereas library doesn’t).

How to install Ruby & Rails on macOS?

Here are the simple 4 steps to install Ruby 3 and Rails v7 on macOS

Step 1: Install Homebrew

First, open your Terminal and run the following steps (I personally use iTerm2).

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

How to quickly setup a LAMP on MacOS

Install PHP 7.3 and MySQL 5.1+

First, let’s install the Mac dependency manager “Homebrew”

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

	# create a data frame
	user_df <- data.frame(
	name = c("Alice", "Bob", "Charlie", "Dave"),
	age = c(25, 32, 47, 19),
	city = c("New York", "San Francisco", "Los Angeles", "Chicago"),
	stringsAsFactors = FALSE
	)

	# view the data frame
	user_df

	# To add in your ~/.zshrc or ~/.bashrc file
	export VOLTA_HOME="$HOME/.volta"
	export PATH="$VOLTA_HOME/bin:$PATH"