🔘no preference

JS ⟩ value ⟩ type ⟩ conversion ⟩ object -> primitive ⟩ no-preference

• no-preference：classes choose their own preference.

⭐️ 重點

no preference

• Date (the only built-in type that) chooses "prefer-string".

• all other built-in types choose "prefer-number".

👥 相關

• ⛔ object -> primitive conversion may result in ⛔️ TypeError❗

📗 參考

• JavaScript: The Definitive Guide ⟩

  • 3.9.2 Explicit Conversions

  • 3.9.3 Object to Primitive Conversions

  • 14.4.7

📘 手冊

• Object.prototype.toString() - object to string.

• Object.prototype.valueOf() - object to (primitive) value, if exists.