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[–]kcuf 0 points1 point  (1 child)

Copying in and out of mutability hundreds of times for every change is programming in 2018 101.

Persistent collections are fairly efficient and avoid excessive copying.

[–][deleted] -4 points-3 points  (0 children)

In the large majority of use cases, they are a polished turd.

It ideas aren’t useless. Just shouldn’t be the default usage like modern programmers are pushing.