it does. values are immutable in the BEAM, not at language level. The impact of bugs is minimized by compartmentalization. This is done from the lowest level w

it does. values are immutable in the BEAM, not at language level. The impact of bugs is minimized by compartmentalization. This is done from the lowest level where each data structure is separate and immutable [1] But you can simulate mutability with stateful processes. Directly from Joe Armstrong: https://joearms.github.io/published/2013-11-21-My-favorite-erlang-program.html https://joearms.github.io/published/2013-11-21-My-favorite-e... [1] https://github.com/happi/theBeamBook/blob/3971e8e2d09e3676702a2a5fa8c494f1f803d555/chapters/ops.asciidoc https://github.com/happi/theBeamBook/blob/3971e8e2d09e367670...