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@spalladino
spalladino / falsehoods-that-ethereum-programmers-believe.md
Last active December 31, 2024 13:29
Falsehoods that Ethereum programmers believe

Falsehoods that Ethereum programmers believe

I recently stumbled upon Falsehoods programmers believe about time zones, which got a good laugh out of me. It reminded me of other great lists of falsehoods, such as about names or time, and made me look for an equivalent for Ethereum. Having found none, here is my humble contribution to this set.

About Gas

Calling estimateGas will return the gas required by my transaction

Calling estimateGas will return the gas that your transaction would require if it were mined now. The current state of the chain may be very different to the state in which your tx will get mined. So when your tx i

@graninas
graninas / What_killed_Haskell_could_kill_Rust.md
Last active July 20, 2025 07:34
What killed Haskell, could kill Rust, too

At the beginning of 2030, I found this essay in my archives. From what I know today, I think it was very insightful at the moment of writing. And I feel it should be published because it can teach us, Rust developers, how to prevent that sad story from happening again.

What killed Haskell, could kill Rust, too

What killed Haskell, could kill Rust, too. Why would I even mention Haskell in this context? Well, Haskell and Rust are deeply related. Not because Rust is Haskell without HKTs. (Some of you know what that means, and the rest of you will wonder for a very long time). Much of the style of Rust is similar in many ways to the style of Haskell. In some sense Rust is a reincarnation of Haskell, with a little bit of C-ish like syntax, a very small amount.

Is Haskell dead?

@Rich-Harris
Rich-Harris / what-is-svelte.md
Last active July 4, 2025 21:38
The truth about Svelte

I've been deceiving you all. I had you believe that Svelte was a UI framework — unlike React and Vue etc, because it shifts work out of the client and into the compiler, but a framework nonetheless.

But that's not exactly accurate. In my defense, I didn't realise it myself until very recently. But with Svelte 3 around the corner, it's time to come clean about what Svelte really is.

Svelte is a language.

Specifically, Svelte is an attempt to answer a question that many people have asked, and a few have answered: what would it look like if we had a language for describing reactive user interfaces?

A few projects that have answered this question:

@yelouafi
yelouafi / algebraic-effects-series-1.md
Last active April 17, 2025 05:09
Operational Introduction to Algebraic Effects and Continuations

Algebraic Effects in JavaScript part 1 - continuations and control transfer

This is the first post of a series about Algebraic Effects and Handlers.

There are 2 ways to approach this topic:

  • Denotational: explain Algebraic Effects in terms of their meaning in mathematics/Category theory
  • Operational: explain the mechanic of Algebraic Effects by showing how they operate under a chosen runtime environment

Both approaches are valuables and give different insights on the topic. However, not everyone (including me), has the prerequisites to grasp the concepts of Category theory and Abstract Algebra. On the other hand, the operational approach is accessible to a much wider audience of programmers even if it doesn't provide the full picture.

@yelouafi
yelouafi / introduction-to-parser-combinators.md
Last active July 7, 2025 21:19

In this tutorial we're going to build a set of parser combinators.

What is a parser combinator?

We'll answer the above question in 2 steps.

  1. What is a parser?
  2. and, what is a parser combinator?

So first question: What is parser?

@shareefhiasat
shareefhiasat / import-rds-certs.sh
Last active August 27, 2024 15:21 — forked from steini/import-rds-certs.sh
import RDS certificates to java keystore on alpine / osx
#!/usr/bin/env sh
#i tried it and working like charm just have to note make the file .sh chmod +x and you may need sudo to run with permission but be carefull with sudo
#be sure the $JAVA_HOME is configure correctly or make it static as commentedline 7 below
OLDDIR="$PWD"
if [ -z "$CACERTS_FILE" ]; then
# you should have java home configure to point for example /usr/lib/jvm/default-java/jre/lib/security/cacerts
CACERTS_FILE=$JAVA_HOME/jre/lib/security/cacerts
fi
@briansmith
briansmith / SECG-Curve-Seeds.txt
Last active June 9, 2022 02:50
SECG Curve Seeds
https://bitcointalk.org/index.php?topic=289795.msg3183975#msg3183975
https://bitcointalk.org/index.php?topic=289795.msg3191346#msg3191346
https://bitcointalk.org/index.php?topic=289795.msg3200275#msg3200275
SECG 1.0: http://www.secg.org/SEC2-Ver-1.0.pdf
ASCII "MinghuaQu"
1. secp112r1 00F50B028E|4D696E676875615175|290472783FB1
2. secp112r2 002757A111|4D696E676875615175|5316C05E0BD4
----| |
3. secp128r1 000E0D|4D696E676875615175|0CC03A4473D03679
@dbathgate
dbathgate / HadoopWithKerberosAuthentication.java
Created October 21, 2016 03:08
Authenticating to Hadoop with Kerberos and accessing HDFS files in Java
import java.io.IOException;
import org.apache.commons.io.IOUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocatedFileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.RemoteIterator;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.security.UserGroupInformation;
@fntlnz
fntlnz / self-signed-certificate-with-custom-ca.md
Last active July 8, 2025 11:45
Self Signed Certificate with Custom Root CA

Create Root CA (Done once)

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl genrsa -des3 -out rootCA.key 4096
@davidejones
davidejones / get_s3_file.sh
Last active July 17, 2024 17:34
curl get file from private s3 with iam role
#!/bin/bash
instance_profile=`curl http://169.254.169.254/latest/meta-data/iam/security-credentials/`
aws_access_key_id=`curl http://169.254.169.254/latest/meta-data/iam/security-credentials/${instance_profile} | grep AccessKeyId | cut -d':' -f2 | sed 's/[^0-9A-Z]*//g'`
aws_secret_access_key=`curl http://169.254.169.254/latest/meta-data/iam/security-credentials/${instance_profile} | grep SecretAccessKey | cut -d':' -f2 | sed 's/[^0-9A-Za-z/+=]*//g'`
token=`curl -s http://169.254.169.254/latest/meta-data/iam/security-credentials/${instance_profile} | sed -n '/Token/{p;}' | cut -f4 -d'"'`
file="somefile.deb"
bucket="some-bucket-of-mine"
date="`date +'%a, %d %b %Y %H:%M:%S %z'`"