🔸parameter

named variable passed into function, used to import arguments.

JS ⟩ object ⟩ function ⟩ parameter

🈯 synonyms： "formal parameter", "function parameter"

a named variable passed into a function, used to import argument(s) into functions.

⭐ in JS, arguments are passed by value❗️

⭐ function declaration instantiation - how parameters are stored.

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

// ⭐️ arguments:
//   • values passed into function when called (run-time)
//   • parameters are initialized to these values.
//   • can be different on each call.
foo( 1, 'hello', false );
//  ╰─── arguments ───╯

foo( 2, 'world', false );
//  ╰─── arguments ───╯

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Last updated 3 years ago

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