MetaDave 🇪🇺

Posted on Apr 18, 2018

Do You Use Calculators or Programs?

#ruby #discuss #maths

I have just realised that I can no longer be bothered to find the calculator program on my Macbook, and instead just open an Interactive Ruby Shell (a.k.a. irb) to do my arithmetic.

I'm wondering if this is a common (dys)function, and does it vary by the language you use?

Are there, for instance, JS programmers out there who will just do a bit of casual arithmetic in their browser console?

Top comments (24)

Andy Zhao (he/him) • Apr 18 '18 • Edited

I use Alfred (a Spotlight search replacement on MacOS) for my calculator:

Here are the steps I took in the gif:

Open Alfred with cmd + space.
Input 5 + 5, which then shows me the result 10 in the "search results".
Input an additional divide by 2 / 2, which gives me 7.5 (because PEMDAS).
Delete the divide by 2, and hit the equal key = to change my input to the result 10.
Divide 10 by 2 / 2 to get my new result of 5.
Multiply by 5 * 5 to get 25.
Hit enter to copy the result of 25 to my clipboard.
Paste 25 to show that I copied it.

This is one of my favorite features of Alfred, especially how intuitive using it feels. I rarely have super lengthy math calculations. If I do need to keep track of everything, I end up using pry (another Ruby REPL) because I like the colors. :)

MetaDave 🇪🇺 • Apr 18 '18

This is great. I guess I should look a bit further into what alfred does, but if it just does my sums that's good enough.

Andy Zhao (he/him) • Apr 18 '18

Alfred is amazing. I personally don't use it too intensively and definitely use the calculator the most out of all its features. I love that it has all sorts of features, even though I don't use a lot of them.

Phil Nash • Jan 21 '19

I do maths in Alfred and string operations in irb. So much easier than anything else I can think of!

Valentin Baca • Apr 18 '18

For me, for most everyday math I use either google (Command+0 mapped to "new chrome tab") or the mac calculator (command+space for Spotlight, type "calc").

For larger personal math stuff, like my budget, I use Google Sheets.

I stay away from using REPL for math for the known issues that come with float handling decimals:

$ python3
>>> 0.1 + 0.2
0.30000000000000004

Our base-10 system isn't without problems (i.e. 1/3), but obviously we're all much more familiar with them.

Meghan (she/her) • Apr 18 '18 • Edited

I still use the Windows Calculator for simple things. Since Windows search has been really good for me, all I have to do to get to it is hit the Windows key then type "cal" and it's right there. For more complicated math I'll use a website.
web2.0calc.com/
desmos.com/calculator
Shameless plug: I also use apps.nektro.net/calculator/

Dian Fay • Apr 18 '18 • Edited

I use a zsh plugin which aliases = to a calculator right in the shell.

MetaDave 🇪🇺 • Apr 18 '18

This is very convenient. Hadn't thought that there might be a shell solution for this.

Ian Johnson • Apr 18 '18

I use Racket to do this also. The nice thing about this is that I can define functions on the fly in lisp-style. I've used irb for this before, but now I use Racket because it has better representations for rational numbers and it's ease of function declaration, thanks to the fact that it is a lisp.

MetaDave 🇪🇺 • Apr 18 '18

Racket, eh? That's a new one for me. I shall investigate.

Ian Johnson • Apr 18 '18 • Edited

Here are some examples. There's a lot more that it can do, but that's a bigger topic. Also, you have to get used to the polish notation.

MetaDave 🇪🇺 • Apr 18 '18

That's really smart-looking stuff. I'll give it a go.

thanks.

PNS11 • Apr 21 '18

Until recently I used CLISP for this purpose, it is slightly easier to do casual arithmetic in it than the fixnum only paradigm in picolisp, and it loads slightly faster than SBCL.

However, stack languages are even better for quickly expressing everyday math, so once I got Factor compiled and running on my boxes it has replaced CLISP as my go-to language for doing calculator stuff.

factorcode.org

rhymes • Apr 18 '18

I do the same, it's either irb or python or even just bc

Andy Zhao (he/him) • Apr 18 '18 • Edited

I learned about bc like yesterday. Blew my mind that it existed. Then again, why wouldn't it? 🤔

MetaDave 🇪🇺 • Apr 18 '18

Oh wow, the old bench calculator. I think I used to use that back in the 80s/90s, when my life was terminal-only HP-UX/AIX. I'm going to revisit that. Cheers!

Ross Henderson • Apr 18 '18

Depends what I'm currently using at the time. If I'm on Brackets, I'll use the Calc. If I'm in SQL Dev I'll do the calculation on that.

MetaDave 🇪🇺 • Apr 18 '18

SQL Dev as-in Oracle SQL Developer?

Ross Henderson • Apr 18 '18 • Edited

Yeah. It's not as easy in retrospect.
select (32 * 123) / 4 from dual

MetaDave 🇪🇺 • Apr 18 '18

No stupid ANSI maths though. That's a plus.

Rose Day • Apr 19 '18

I usually use Matlab because it's still downloaded on my computer and it's easy to use for most things I need to calculate.

MetaDave 🇪🇺 • Apr 20 '18

That seems like a sledgehammer-to-crack-a-nut to me, but I think if there's a lesson in here it's that arithmetic is just a commodity, and people use whatever tool is convenient/familiar to solve it.

At least you have a scalable solution there though! :)

Rose Day • Apr 20 '18

Ha, it really is like a sledgehammer for most problems! I have it because I used it a lot in my undergrad for class work and projects so mine as well use it every now and again.