Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript Asynchronous Programming with JavaScript Understanding Promises Create a Promise

Posted by Edelweiss Villoria
Edelweiss Villoria
4,801 Points

What's a parameter?

Could you just give me a quick overview?

1 Answer

Brandon White
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Brandon White
Full Stack JavaScript Techdegree Graduate 34,662 Points
Brandon White
.a{fill-rule:evenodd;}techdegree seal-36
Brandon White
Full Stack JavaScript Techdegree Graduate 34,662 Points

Hi Edelweiss,

A parameter is the part of a function definition that represents the unknown input to that function.

So in the following:

function squareNum(num) {
    return num * num
}
// the num variable is a parameter

console.log(squareNum(5)) // 5 is the argument

Parameters and arguments are closely related, but the parameter is the variable that you’re using to represent the argument that will later be passed in.