Orlando Alemán orlandoaleman

Note: I'm not involved in Prepack in any way — please correct me if I say anything incorrect below!

A few people have asked me if Prepack and Svelte are similar projects with similar goals. The answer is 'no, they're not', but let's take a moment to explore why.

What is Prepack?

Prepack describes itself as a 'partial evaluator for JavaScript'. What that means is that it will run your code in a specialised interpreter that, rather than having some effect on the world (like printing a message to the console), will track the effects that would have happened and express them more directly.

So for example if you give it this code...

	function eachAsync(collection, iterator, callback) {
	var iterate = function(i) {
	setTimeout(function() {
	iterator(collection[i]);
	if (i < collection.length) {
	iterate(i + 1);
	} else {
	callback();
	}
	}, 0);

	#import <Foundation/Foundation.h>

	@interface UIBarButtonItem (appearance)

	+ (void) setupAppearance;

	@end

	#define ApplicationDelegate ((AppDelegate *)[[UIApplication sharedApplication] delegate])
	#define UserDefaults [NSUserDefaults standardUserDefaults]
	#define NotificationCenter [NSNotificationCenter defaultCenter]
	#define SharedApplication [UIApplication sharedApplication]
	#define Bundle [NSBundle mainBundle]
	#define MainScreen [UIScreen mainScreen]
	#define ShowNetworkActivityIndicator() [UIApplication sharedApplication].networkActivityIndicatorVisible = YES
	#define HideNetworkActivityIndicator() [UIApplication sharedApplication].networkActivityIndicatorVisible = NO
	#define NetworkActivityIndicatorVisible(x) [UIApplication sharedApplication].networkActivityIndicatorVisible = x
	#define NavBar self.navigationController.navigationBar

	#!/usr/bin/env bash

	rm -rf "${HOME}/Library/Caches/CocoaPods"
	rm -rf "`pwd`/Pods/"
	pod update

	#
	# Uncrustify Configuration File
	# File Created With UncrustifyX 0.2 (140)
	#

	# Alignment
	# ---------

	## Alignment

	#!/usr/bin/env ruby -w

	class String
	def starts_with?(prefix)
	prefix.respond_to?(:to_str) && self[0, prefix.length] == prefix
	end
	end

	HEADER_REGEX = /^#import\s+["<](.*)[">]/

	# NOTES

	# Spotify 0.9 vs 1.0 is stable, uses less resources overall and works well with Spotify Connect, SpotCommander, Local Files etc
	# Tested and works on Fedora 29 64-bit with GNOME, but should work on previous versions as well
	# The sources of the Dropbox files, which are hosted by me and the latest and greatest available, are listed above each one
	# No system files will be overwritten by these or used by other programs since they depend on the later Fedora versions
	# Make sure you copy the whole lines into Terminal
	# Each command is on one line and might be long

	# START GUIDE

	###
	###
	### UPDATE: For Win 11, I recommend using this tool in place of this script:
	### https://christitus.com/windows-tool/
	### https://github.com/ChrisTitusTech/winutil
	### https://www.youtube.com/watch?v=6UQZ5oQg8XA
	### iwr -useb https://christitus.com/win \| iex
	###
	###

	# Redis Cheatsheet
	# All the commands you need to know


	redis-server /path/redis.conf # start redis with the related configuration file
	redis-cli # opens a redis prompt


	# Strings.