Parameters and arguments

You may have noticed that we are talking about parameters and arguments. Both terms are commonly used to mean the information that is passed into a function:

function tester(para1, para2){
    return para1 + " " + para2;
}
const arg1 = "argument 1";
const arg2 = "argument 2";
tester(arg1, arg2);

A parameter is defined as the variable listed inside the parentheses of the function definition, which defines the scope of the function. They are declared like so:

function myFunc(param1, param2) {
  // code of the function;
}

A practical example could be the following, which takes x and y as parameters:

function addTwoNumbers(x, y) {
  console.log(x + y);
}

When called, this function will simply add the parameters and log the result. However, to do this, we can call the function with arguments:

myFunc("arg1", "arg2");

We have seen various examples of arguments; for example:

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