is it common to mutate function arguments in ruby?

I'm coming from the JS world where immmutability is the key to sanity

EDIT: think i got it - we can sort and reverse in place since chars returns a new array. No args are being mutated

I saw some floats provided, so I chose to reject strings rather than select integers.

Ye the condition already returns true or false

I like it. You could even drop the ? true : false, right?

haha, yeah I always find tons of stuff with my code right after submitting :D

Yes, my bad. Already after I submitted, I realized that this part is redundant, but was to lazy to remove it. Thanks for noticing.

takes a list of non-negative integers and strings

I'd assume that when we remove all the strings, the only things left are the integers.

Internet Archive is online, though.

Used .bytes because ruby-doc.com is offline today and I can't find the right methods :D

why did you add the ? true : false?

Technically wrong, as the specs said: "remove all the strings". The tests are not good enough to catch that though.