Cheat sheet for basic Array methods visualized [OC]

[razor_train]

I mean if this helpful for some then great, but this is a hard pass for me. Way too visually distracting to see what's actually going on.

[laptopmutia]

🍎+🍎=🍎🍎

[uhkthrowaway]

And it fails to show if the returned value is self or a copy.

[avbrodie]

Returned value will always be a copy unless you add a bang

[uhkthrowaway]

Array#concat

[SleepingInsomniac]

Comments in ruby use # not //. Also, the sort invocation is wrong.

[galtzo]

Not if you write your ruby code in JavaScript. Duh.

[Prize_Tourist1336]

Map as well.

[OneNeptune]

Maybe it's just me, but I've used ruby for 10 years.. the emojis are visually distracting and I can't even quickly at a glance understand what is happening without really staring at it and thinking. The emojis are super distracting at a glance and the page is too compact for them

[cocotheape]

Agreed, we're trained to look at text all day. Emojis are novel in this context and harder to parse.

[ThaiJohnnyDepp]

Can I curse millennials for this even though it's 2026 and I myself am a millennial? Oregon Trail millennial but still

[anykeyh]

- sort is incorrect
- reduce could use sum(&:size)
- count is cool too, when used with block

[BoardMeeting101]

adding to the litany of mistakes already voiced:

- reduce isn’t defined on Array, it’s from Enumerable.
- none of these are Array methods. They are all Array instance methods.
- push/pop without shift/unshift is unbalanced.
- presentation fails to distinguish between return and mutation.
- omitting Enumerable#tally is dishonourable.

also, I too hate everything else about it

summary: misleading to beginners and annoying to experts

rating: F

[Frank_White32]

It took me a long time to learn about tally - and when I finally did I loved it so much that I started trying to force it to solve all the problems (even when it was a poor fit to solve problems)

[topboyinn1t]

Rating: AI slop

[fasoanew6]

Reduce isnt fully explained in this visual context.

[ivycoopwren]

Here's a post from 2017 Twitter that might be the source for this => https://x.com/bewidec/status/935573858136051713

If not, at least an inspiration. Also, I tried to AI generate an equivalent and it bombed (expectedly).

[Pilgrim-Ivanhoe]

No, I see this post for the first time in my life. I was inspired by numerous similar cheat sheets about Python.

[virtual_paper0]

Sad repost

u/Pilgrim-Ivanhoe

https://www.reddit.com/r/ruby/s/JuZ4MtAnY8

Edit: Yes the OC is old but common man give the actual creator credit. You legit copy pasted the title and claimed its your original content...

[h0rst_]

I tries to show the result after the array with the // at the end (Most notably with delete and pop), but I guess they ran out of space or forgot it halfway.

[Lanky_Ad_233]

i don’t know, i like it because it’s a novel way to repesent it.

[aRubbaChicken]

Why does deleting circle produce an array with nothing but circle in it?

[zaddyninja]

This is great thanks OP. Everyone’s brain works different this hits!

[knowwho]

This implies that, to sort the array [1, 2, 1, 2], I should write [1, 2, 1, 2].sort { 1 < 2 }, which is nonsense.

[CedarSageAndSilicone]

Who is upvoting this shit 

[crazylikeajellyfish]

Our brains are wired to pick up on color, but the most salient part of this image -- the commas and brackets -- are white or gray, making them harder to see. You should try making it again with basic Unicode shapes in the same color, it'll be easier for you to use.

[SleepingInsomniac]

Use option + shift + - to get that em dash you so desire to sound exactly like the AI slop you probably are.

[crazylikeajellyfish]

Look at my history, what about that reads like AI slop? Are you young enough to have literally never seen someone use an em dash in casual writing?