Add 40x scripts

sh/401-node

@@ -0,0 +1,16 @@
+#!/bin/sh
+#
+# Node lets us write JavaScript code outside of the browser.
+#
+# Yarn is the preferred dependency manager, however, some programs
+# have npm hard-coded as a dependency, so we install that as well.
+#
+# https://wiki.archlinux.org/index.php/Node.js
+
+set -xe
+
+pacman -S nodejs
+
+pacman -S npm
+
+pacman -S yarn

sh/402-crystal

@@ -0,0 +1,21 @@
+#!/bin/sh
+#
+# Crystal is a nice programming language that lets us use
+# the usability of Ruby with the performance of C.
+#
+# `shards` is the official dependency manager for Crystal.
+#
+# The low level virtual machine (llvm) is used to build
+# crystal directly from the source. This is useful when
+# we're making changes to the Crystal programming language
+# itself.
+#
+# https://wiki.archlinux.org/index.php/Crystal
+
+set -xe
+
+pacman -S crystal
+
+pacman -S shards
+
+pacman -S llvm

sh/403-rust

@@ -0,0 +1,21 @@
+#!/bin/sh
+#
+# Rust is a nice programming language that finds many errors
+# for us at compile time. This is useful for writing safe code.
+#
+# The `rustup` package is used over `rust` because this allows us
+# to have multiple rust versions at any given time and update them
+# as needed.
+#
+# There are 3 toolchains: stable, beta, and nightly. In this script
+# we install the stable toolchain and make it the default.
+#
+# https://wiki.archlinux.org/index.php/Rust
+
+set -xe
+
+pacman -S rustup
+
+rustup install stable
+
+rustup default stable

sh/404-java

@@ -0,0 +1,10 @@
+#!/bin/sh
+#
+# Java is a programming language used in many programming contests.
+# This is arguably the only reason why we have it here.
+#
+# https://wiki.archlinux.org/index.php/Java
+
+set -xe
+
+pacman -S jdk10-openjdk