🔰v8

JS engine used in Chrome/Node.

JS ⟩ concepts ⟩ environment ⟩ JS engine ⟩ v8

a JS engine used in Chrome / Edge / Opera / Node.js.

⭐️ 重點

v8 behaves contrary to the spec in function in block (FiB)❗

v8 will do lexical environment optimizaton, be aware❗