⚖️parameter vs. argument

JS ⟩ object ⟩ function ⟩ parameter ⟩ argument vs. parameter

• parameter(s)

  • live in function's definition (compile-time)

  • named variable declared in the function.

• argument(s)

  • live in call sites ( runtime, may be different on each call)

  • a value for the corresponding parameter.

// ⭐️ function's definition (compile-time)
function foo( param1, param2, ... ) { ... }
//           ╰─── parameters ────╯

// ⭐️ values passed into function when called (run-time)
foo( 1, 'hello', false );
//  ╰─── arguments ───╯

👥 相關

• parameter

• argument

📘 手冊

• Argument

• Parameter

• the "arguments" object - an array-like.