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argument vs parameter

Written byPhuoc Nguyen
02 Jun, 2020
Last updated
20 Aug, 2020


A parameter is the variable belonging to the declaration of a function.
An argument is the actual value of the parameter that is passed to the function.
Assume that we have a function that calculates the sum of two numbers:
const sum = function (a, b) {
return a + b;
here `a` and `b` are the parameters. If we call the function, `sum(1, 2)`, then `1` and `2` are the arguments.


There is a handy memory hook to distinguish these terms:
Parameter → Placeholder
Argument → Actual value

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Phước Nguyễn