⭕unary arithmetic operator

JS ⟩ statement ⟩ expression ⟩ operator ⟩ arithmetic ⟩ unary

unary plus (+), unary minus (-), increment (++), decrement (--)

🌟 table of operators

⭐️ 重點

convert any value (except Symbol, BigInt) to Number.

// any -> number (except Symbol, BigInt)
+x

+Symbol()   // ⛔️ TypeError
+40n        // ⛔️ TypeError
// TypeError: Cannot convert a Symbol/BigInt value to a number

🧨 雷區

• cannot convert Symbol to Number❗️

• cannot convert BigInt to Number❗️

🔴 主題

• unary plus (+), 🚧

• unary minus (-),

• increment (++),

• decrement (--)

📗 參考

• JavaScript: The Definitive Guide ⟩ 4.8.2 Unary Arithmetic Operators