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Posted by jpluimers on 2017/12/07
Since I’m in a C mood today: Free book: [WayBack] Writing Bug-Free C Code, A Programming Style That Automatically Detects Bugs in C Codeby Jerry Jongerius / January 1995.
Be sure to credit the author.
Via: [WayBack] Writing Bug-Free C Code A Programming Style That Automatically Detects Bugs in C Codeby Jerry Jongerius / January 1995 – Ilya S – Google+
–jeroen
Posted in C, Development, Software Development | 1 Comment »
Posted by jpluimers on 2017/12/07
Ah, C. The best lingua franca we have… because we have no other lingua francas. Linguae franca. Surgeons general? C is fairly old — 44 years, now! — and comes from a time when there were possibly more architectures than programming languages. It works well for what it is, and what it is is a relatively simple layer of indirection atop assembly. Alas, the popularity of C has led to a number of programming languages’ taking significant cues from its design, and parts of its design are… slightly questionable. I’ve gone through some common features that probably should’ve stayed in C and my justification for saying so. The features are listed in rough order from (I hope) least to most controversial. The idea is that C fans will give up when I call it “weakly typed” and not even get to the part where I rag on braces. Wait, crap, I gave it away.
Great re-read towards the end of the year: [WayBack] Let’s stop copying C / fuzzy notepad
Via: [WayBack] Old and busted: emacs vs vi. New and hot: Language war, everybody against everybody else. – Kristian Köhntopp – Google+
–jeroen
Posted in .NET, APL, Awk, bash, BASIC, C, C#, C++, COBOL, CoffeeScript, CommandLine, D, Delphi, Development, F#, Fortran, Go (golang), Java, Java Platform, JavaScript/ECMAScript, Pascal, Perl, PHP, PowerShell, PowerShell, Python, Ruby, Scala, Scripting, Software Development, TypeScript, VB.NET, VBScript | 3 Comments »
Posted by jpluimers on 2017/12/06
Oh nice. Feel free to QP. Fails at least in Delphi XE8.
program E2003WithConstsInDescendingClassesConsoleProject;
{$APPTYPE CONSOLE}
uses
ParentUnit in 'ParentUnit.pas',
ChildUnit in 'ChildUnit.pas';
begin
end.
unit ParentUnit;
interface
type
TParent = class
// section can be strict protected, protected, public, published or nothing
const
InitialBooleanValue = False;
InitialIntegerValue = -1;
end;
implementation
end.
unit ChildUnit;
interface
uses
ParentUnit;
type
TChild = class(TParent)
// section can be strict protected, protected, public, published or nothing
const
// Initial and final values need to be different to test the behaviour
FinalBooleanValue = not InitialBooleanValue;
FinalIntegerValue = InitialIntegerValue + 1;
//[dcc32 Error] ChildUnit.pas(13): E2003 Undeclared identifier: 'InitialBooleanValue'
//[dcc32 Error] ChildUnit.pas(14): E2003 Undeclared identifier: 'InitialIntegerValue'
//[dcc32 Error] ChildUnit.pas(14): E2026 Constant expression expected
end;
implementation
end.
[WayBack] Oh nice. Feel free to QP. unit ParentUnit; interface type TParent = class …
Posted in Delphi, Delphi XE8, Development, Software Development | 3 Comments »
Posted by jpluimers on 2017/12/06
If I ever need to read why, here are the explanatory links:
TL;DR:
google.com by your domain name).
dig:
dig +trace +additional google.com
Notes:
+trace will turn off recursive queries, which is good.google.com because it has nameservers in the .com TLD (example.org has nameservers in the .net TLD: http://leafdns.com/index.cgi?name=example.org)At the time of writing the dig output is this:
Posted in DNS, Internet, Power User | Leave a Comment »
Posted by jpluimers on 2017/12/05
Cool: @filmfranz made an advent calendar on Python data analysis featuring a lot of Pandas examples referring to source code found on the interwebz: [WayBack] Data Science Advent – franz.media.
First example is to eliminate outliers in the below graph.
He also has a really cool (German) Playlist on data analysis with Python called Datenanalyse in Python and has a great site with examples at franz.media.
–jeroen
via: [WayBack] Very cool idea: an advent calendar with tips for doing data science with Python and Pandas created by @filmfranz 👉 http://franz.media/advent.html – ThisIsWhyICode – Google+
Posted in Development, Python, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2017/12/05
The [WayBack] Interactive map of Linux kernel is way better than the static versions below that I got via
[WayBack] Interactive map of the Linux kernel subsystems. A little bit beyond what is required to use Linux. But great for those who want a deeper understanding of the kernel. – Joe C. Hecht – Google+
–jeroen
Posted in *nix, Development, Linux, Power User, Software Development | Leave a Comment »
Posted by jpluimers on 2017/12/04
Delphi tip of the day:
{$WARN UNSUPPORTED_CONSTRUCT ERROR}
It will throw a compiler error when you use an attribute that isn’t defined as the above [WayBack] turns a warning into an error as normally [WayBack] UNSUPPORTED_CONSTRUCT is only a warning.
Which means that this code now fails:
type
TmyClass = class
[djhgfskdhgks]
procedure One;
end;
Thanks [WayBack] +Agustin Ortu for posting this tip!
I wish I had known this when I found the G+ post leading to On turning “W1025 Unsupported language feature: ‘customattribute’” into a compiler error.
–jeroen
via:
related:
Posted in Delphi, Development, Software Development | 2 Comments »
Posted by jpluimers on 2017/12/04
via: [WayBack] Hacker News – coinmon: In case you don’t want to install 61 packages [1] :) and [WayBack] The curl + jq based approach to check Bitcoin prices looks a bit more attractive than using a node.js package with 61 dependencies, doesn’t it? Source:… – ThisIsWhyICode – Google+
Function to call curl from bash:
$ coinmon() { > curl "https://api.coinmarketcap.com/v1/ticker/?convert=$1" | jq ".[0] .price_$1" > } $ coinmon eur "6988.4723188"
Or in Python (from the same HackerNew thread): [Archive.is] https://www.pastery.net/jnscrh/
#!/usr/bin/env python3 from urllib.request import urlopen from decimal import Decimal import json def print_coin(coin): print("{} ticker:".format(coin["name"])) print("Price: {:,} EUR".format(Decimal(coin["price_eur"]))) print("Market cap: {:,} EUR".format(Decimal(coin["market_cap_eur"]))) print() r = urlopen("https://api.coinmarketcap.com/v1/ticker/?convert=eur") coins = json.loads(r.read().decode("utf8")) for coin in coins: if coin["id"] in ("bitcoin", "ethereum", "ripple", "monero"): print_coin(coin)
–jeroe
Posted in Development, JavaScript/ECMAScript, Node.js, Software Development | Leave a Comment »
Posted by jpluimers on 2017/12/03
Must read: [WayBack] Some Thoughts on the Docker-Kubernetes Announcement – Scott’s Weblog – The weblog of an IT pro specializing in cloud computing, virtualization, and networking, all with an open source view
Via a thread with great comments: [WayBack] Two weeks ago, Scott Lowe mused about the Docker-Kubernetes announcement. https://blog.scottlowe.org/2017/10/17/some-thoughts-on-docker-kubernetes-anno… – Kristian Köhntopp – Google+
–jeroen
Posted in Cloud, Containers, Docker, Infrastructure, Kubernetes (k8n) | Leave a Comment »
Posted by jpluimers on 2017/12/03
As of 20170711, the servername ftp.xs4all.nl does not support the ftp protocol any more; xs4all clients can only use the server sftp.xs4all.nl on port 22.
I missed that because I hardly use ftp except for the few rare occasions where I was in an environment without ftp.
So recently I found out: good move!
Since I still need this every now and then (but far less often than 10 years ago), I have set up a very small ftp server at home with limited storage and very limited users that I can turn on/off when needed.
Much better solution.
–jeroen
Source: [WayBack] XS4ALL gaat stoppen met ondersteuning van ftp – Security.NL
Posted in Communications Development, Development, FTP, Internet protocol suite, Power User, TCP | Leave a Comment »
The Wiert Corner - irregular stream of stuff 