Clojurians Log v2
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grav 2024-03-21T20:12:47.442309Z
python:
l=[[]]*4; l[0].append("YOLO"); l
> [['YOLO'], ['YOLO'], ['YOLO'], ['YOLO']]🫠2
seancorfield 2024-03-21T20:14:26.296859Z
Because mutability...
grav 2024-03-21T20:23:06.399249Z
Yeah, actually this post triggered me: https://clojurians.slack.com/archives/C03A6GE8D32/p1710956328696939?thread_ts=1710955729.886189&cid=C03A6GE8D32
seancorfield 2024-03-21T20:26:09.225299Z
I work in a JS codebase as well as a Clojure codebase at work. The JS code uses Immutable.js (and React/Redux) but I still trip over mutability sometimes and I stare at the code and think "WTF?" ... and then I realize "Oh, darn, that modifies the object I'm holding 😞 "
Cora (she/her) 2024-03-22T04:55:54.492669Z
sort on arrays in js mutates the original -- completely unforgivable
Cora (she/her) 2024-03-22T04:57:35.686519Z
that and reverse
grav 2024-03-23T21:23:19.463559Z
Interestingly, it's not what happens in SuperCollider:
(
x = [] ! 4;
x.at(0).add(\WAT);
x;
)
-> [ [ WAT ], [ ], [ ], [ ] [] has an implicit function call in it, so that it's a new instance everytime.grav 2024-03-23T21:23:43.322659Z
Since, for instance
42.rand.dup(4);
-> [ 28, 28, 28, 28 ]{42.rand}.dup(4);
-> [ 38, 25, 37, 25 ]grav 2024-03-23T21:27:32.247729Z
( ! is the same as the .dup method)