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This information applies to the PICO-8 0.1.6 release.

This document is here to help folks with a proficiency in Lua understand the limitations and discrepencies between Lua and PICO-8's Lua.

You can always view the manual or yellowafterlife's extended 0.1.1 manual.

General

• anything written in uppercase the PICO-8 editor or .p8 is made lowercase by the editor. → editing the .p8 file directly can work
• print(function() end) outputs the string function instead of the string function: 0x0000000.

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// SRTP: Statically Resolved Type Parameters
// https://docs.microsoft.com/en-us/dotnet/fsharp/language-reference/generics/statically-resolved-type-parameters

// SRTP Allows for pulling members out of types that where the member is named and typed the same
// In this example SRTP will be used to pull out the 'First: string' and 'Last: string' members
// from different types

// One example of SRTP in the F# Base Class Library is the (+) operator. 
// You'll see that it has this type signature:

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$images = 'https://foo.jpg', 'https://bar.jpg'
$targetDir = 'C:\foo\bar'

function DownloadFile([Object[]] $sourceFiles,[string]$targetDirectory) {
 $wc = New-Object System.Net.WebClient

 foreach ($sourceFile in $sourceFiles){
  $sourceFileName = $sourceFile.SubString($sourceFile.LastIndexOf('/')+1)
  $targetFileName = $targetDirectory + $sourceFileName
  $wc.DownloadFile($sourceFile, $targetFileName)      

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-- http://blog.jooq.org/2013/11/19/how-to-create-a-range-from-1-to-10-in-sql/

IF EXISTS (SELECT *
             FROM dbo.sysobjects
            WHERE id = object_id (N'[dbo].[generate_series]')
              AND OBJECTPROPERTY(id, N'IsTableFunction') = 1)
DROP FUNCTION [dbo].[generate_series]
GO

CREATE FUNCTION [dbo].[generate_series] ( @p_start INT, @p_end INT)

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// Convert from normal to web-safe, strip trailing "="s
function webSafe64(base64) {
    return base64.replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
}

// Convert from web-safe to normal, add trailing "="s
function normal64(base64) {
    return base64.replace(/\-/g, '+').replace(/_/g, '/') + '=='.substring(0, (3*base64.length)%4);
}

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// i ported that "fizzbuzz in tensorflow" to F# and Accord.Net's DeepBeliefNetwork
// http://joelgrus.com/2016/05/23/fizz-buzz-in-tensorflow/

#r "Debug/Accord.dll"
#r "Debug/Accord.Math.dll"
#r "Debug/Accord.Neuro.dll"
#I "Debug"

open Accord.Neuro
open Accord.Neuro.Networks

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static class EventStoreConnectionExtensions
{
    public static Task<EventStoreRxSubscription> SubscribeToAll(this EventStoreConnection connection, bool resolveLinkTos)
    {
        return Task<EventStoreRxSubscription>.Factory.StartNew(() => {
            var subject = new Subject<ResolvedEvent>();

            var subscriptionTask = connection.SubscribeToAll(resolveLinkTos, subject.OnNext, () => subject.OnError(new SubscriptionDroppedException()));
            subscriptionTask.Wait();

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

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Latency Comparison Numbers
--------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

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tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname