🚧operator

🚧 under construction

JS ⟩ statement ⟩ expression ⟩ operator ⟩

(expression)

arithmetic / comparison / logical / assignment expressions, categorized as：

• prefix / infix / postfix operators.

• unary / binary / ternary operators.

🌟table of operators

⭐️ 重點

JS operators usually convert the type of their operands as needed.

operator(s) that expect boolean operands will work with an operand of any type❗(every value is truthy or falsy)

property access and invocation expressions have higher precedence than any of the operators.

• most operators are represented by punctuator(s).

• some are represented by keyword(s) such as delete and instanceof.

🔴 主題

• 🌟table of operators

• types of operators

  • assignment (=, +=, -=, *=, /=, ...)

  • arithmetic operator

    • unary arithmetic operator (+, -, ++, --)

    • binary arithmetic operator (+, -, */%**

    • bitwise operator (&, |, ^, ~, >>, <<, >>>)

  • relational operator

    • (==, ===),

    • (<, >, <=, >=)

  • logical operator (&&, ||, !)

  • categorized by associativity

    • L (left-hand side)

      • property access expression ( ., [], ?., ?.[], ?.() )

  • categorized by arity

    • unary operator：

      • typeof / delete / void

    • binary operator：

      • nullish coalescing (??)

      • double tilde (~~)

      • comma operator (,)

    • ternary operator： conditional operator (?:)

• yield* operator - application： *sequence()

👥 相關

• ➕ arithmetic operators (+, -, *, /, %, **) operate on numbers.

• TS Operators

📗 參考

• JavaScript: The Definitive Guide ⟩

  • 3.9

  • 4.7 Operator Overview

📘 手冊

• Expressions and operators

• Operator precedence