alt Hacker NewsNope, it's value semantics (unlike Python), the references are just an internal optimization. Implicit copies happen when a list/dict with more than one reference is mutated.
Nope, it's value semantics (unlike Python), the references are just an internal optimization. Implicit copies happen when a list/dict with more than one reference is mutated.
> the references are just an internal optimization
Optimization specifically for function calls, or... ?
Because if you're doing all this copy-on-write anyway, the indirection seems to be a needless cost in other contexts.