Dynamic languages are useful tools. Scripting allows users to rapidly and succinctly tie together complex systems and express ideas without worrying about details like memory management or build systems. In recent years programming languages like Rust and Go have made it much easier to produce sophisticated native machine code; these projects are incredibly important developments in computer infrastructure. However, we claim it is still important to have a powerful scripting environment that can address a wide range of problem domains.
swc is fast. Very fast. It's 18x faster than babel on a single-core benchmark, and on a parallel benchmark, it's 68x faster than babel on a 4 core (8 HT) machine. Why? Just because it's written in rust? No. Its fundamental design differs from any other tool.
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What happens when a data collection is copied and then the new copy is changed? Does the original remain the same, or does it change too?
If you think of copying as creating a completely new object, of course you expect that any change to the new copy does not affect the original object. But if you think of copying as creating a new name for the same, single object, then you expect that any change to the object through the new name appears also when you access the same object through the old name.
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