On: PyPy.js: A fast, compliant Python implementation f...

[henryaj]

Please humour my lack of knowledge: is there much difference between something like this and Opal[0]?

[0] - http://opalrb.org

[Veedrac → henryaj]

PyPy.js is not a transpiler, it is a JITted interpreter. This has correctness advantages since the major work is upfront, and potential throughput advantages, but is results in huge upfront download and warmup costs.