➕exponentiation (**)

🚧 under construction

JS ⟩ operator ⟩ arithmetic ⟩ exponentiation (**)

(⭐ES2016) 👉 table of operators

a ** x    // exponentiation

⭐️ 重點

** operator

• precedence relative to the unary negation operator is not defined❗

• explicitly use parentheses when mixing - with **❗

• equivalent to Math.pow() (except ** also accepts BigInts)❗

👉 table of operators

💈範例

• replit：exponentiation (a ** n)

   -3**2,    // ⛔ SyntaxError
// ^^^^
// ⛔ SyntaxError: 
//    Unary operator used immediately before exponentiation expression. 
//    Parenthesis must be used to disambiguate operator precedence.

(-3) ** 2,    //  9
-(3 ** 2),    // -9

👥 相關

• ⛔ possible errorrs

  • SyntaxError：... parenthesis must be used to disambiguate operator precedence❗

📗 參考

• JavaScript: The Definitive Guide ⟩ 4.7.3, 4.8

📘 手冊

• Exponentiation (**)

• Math.pow()

• Math.exp() - returns e raised to the power of a number.

🚧

• unary negation operator