⚖️strict vs. sloppy

🚧 under construction

JS ⟩ concepts ⟩ environment ⟩ JS engine ⟩ mode ⟩ strict vs. sloppy

👥 相關

• strict mode / sloppy mode

📗 參考

• JavaScript: The Definitive Guide ⟩ 5.6.3 "use strict"

📘 手冊

• Strict mode

⭐️ feature	🛡️ strict mode	❗️ sloppy mode
with statement	❌ forbidden	✅ OK
variable must be declared	✅ yes	❌ no
this context of function	undefined	global object
assignment to non-writable property / create property on non-extensible object	⛔ TypeError	❗ fails silently
		🚧 ... to be continued