Ask HN: What technologies did you learn in 2018?

Post by amelius » Mon, Dec 24, 2018, 1:50 PM UTC

pzixel wrote: post #385

amelius wrote: post #231

Earlier quoted context omitted.

Have you tried writing a doubly linked list? https://rcoh.me/posts/rust-linked-list-basically-impossible/

1. Do you often try to implement data structures like this? In my practice, arrays are almost always better. 2. Beside that, you may argue that I use "Don't have therefore is not required" argument. But it contained partial truth: if you fight Rust program model then you have to do some extra steps to achieve it. Rust borrowing model considers one owner who can share its data among consumers. And this is damn common…

Post by dietdrb » Mon, Dec 24, 2018, 2:26 PM UTC

maceurt wrote: post #532

I learned Spring MVC. Interesting framework for back end web development. It was hard at first to use Spring, coming from Django which is a lot easier to start using, however I prefer it in a lot of ways to Django. The controllers are pretty intuitive to make and I much prefer them to views in Django, and the actual database querying and using while at first is a lot harder than Django, it makes a lot more sense afte…

Post by mkl » Mon, Dec 24, 2018, 2:32 PM UTC

a_bonobo wrote: post #461

Zhyl wrote: post #436

Earlier quoted context omitted.

Yeah, it has equivalents for each. Sed: perl -pe 's/foo/bar/' file1 Grep: perl -pe '/foo/' file1 uniq: perl -ne 'print unless $seen{$_}++' file1 But then you can combine conditions: perl -ne 's/foo/bar/ if /baz/ && /yot/; print "Line number $. changed to $_"' file1 And do some awk-ish line splitting: perl -F, -ane '$sum += $F[2]; END{ print "The sum of column 3 is $sum" }' file1 It absolutely flies in the face of the…

This blew my mind recently, when I had to delete millions of files in a directory and rm didn't make the cut (too many arguments), and find -delete took forever: https://unix.stackexchange.com/a/79656 perl -e 'for( ){((stat)[9] seems to be the fastest possible way to delete enormous amounts of files

  find -type f -print0 | xargs -0 rm

Post by maliker » Mon, Dec 24, 2018, 2:58 PM UTC

4thaccount wrote: post #440

maliker wrote: post #355

Earlier quoted context omitted.

Mostly focused on distribution engineering analysis: distributed generation interconnection, energy storage dispatch, demand response planning. Hoping to do more transmission analysis in the future but for now work mostly with distribution utilities.

Interesting. I'm working a bit with energy storage modeling on the transmission side and am familiar with the other topics you mentioned although everything is 10x harder with distribution as the load flows are unbalanced as I understand it. Transmission systems are gargantuan, but at least you can assume steady-state in most cases. Are you with a utility, University, national lab, or contractor?

Post by C1sc0cat » Mon, Dec 24, 2018, 3:17 PM UTC

tmaly wrote: post #82

Zhyl wrote: post #8

Weirdly, perl. I found myself on a client site in a locked down environment with only the Windows version of GIT installed. Powershell disabled, no other programs allowed. I had to produce reports on the log files for this machine, but had to obfuscate information before taking it off the server. I discovered that git had bash installed quite early on, so my initial automation and reporting was based on UNIX pipeline…

My team has used Perl successfully for 13 years. We use modern Perl and the code is clean. In the process of switching new team members to Python as it is hard to hire people with Perl. I still think the meta capability in Perl is stronger than Python.