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JavaScript JavaScript Basics (Retired) Creating Reusable Code with Functions Giving Information to Functions

MICHAEL P
MICHAEL P
5,191 Points
Posted by MICHAEL P
MICHAEL P
5,191 Points

"Uncaught reference error" in JavaScript-Please help!Followed Video and Still Have This Problem!

Hi,

I followed the code, and typed it exactly the way that the teacher put it in. For some reason I am getting an error on . I am hoping that someone can help me make sense of this. I am also posting my code.

random.js.13

function getRandomNumber( upper ) {
  var randomNumber = Math.floor( Math.random() * upper ) + 1; 
  return randomNumber;
}
/*
console.log( getRandomNumber(6) );
console.log( getRandomNumber(100) );
console.log( getRandomNumber(10000) );
console.log( getRandomNumber(2) );
*/
function getArea(width, legth) {
  var area = width * legth;
  return area + "" + unit ;
}
console.log(getArea(10, 20, 'sq ft'));

3 Answers

john larson
john larson
16,594 Points

You forgot to add the unit as a parameter, let me know if you need more explanation

function getRandomNumber( upper ) { 
  var randomNumber = Math.floor( Math.random() * upper ) + 1; return randomNumber; }
 function getArea(width, legth, unit) { /*add unit parameter*/
  var area = width * legth; return area + "" + unit ; 
} 
console.log(getArea(10, 20, 'sq ft'))
Sean VandeMore
Sean VandeMore
6,727 Points
Sean VandeMore
Sean VandeMore
6,727 Points

One thing to note is "random.js.13" means that an error is occurring on line 13 in the random.js file. Sometimes those are helpful hints in debugging.

john larson
john larson
16,594 Points

agreed Sean. That's how I found the error.

MICHAEL P
MICHAEL P
5,191 Points
MICHAEL P
MICHAEL P
5,191 Points

Thanks guys. The thing is, that the teacher "Dave" typed the code exactly as I had it. I don't recall him typing that extra parameter.

Would the "add unit parameter", be the "sq ft"?

So, John Larson, is the code that you typed correct? With the "add unit parameter"?

Sean VandeMore
Sean VandeMore
6,727 Points

Hi Michael,

John put the "add unit parameter" as a comment since it is wrapped in /* insert comment here */. He added the unit parameter right before that in the (). The string 'sq ft' in the second code example would be the unit parameter.

Below we created a function named getArea. 

function getArea(width, length, unit)  {
  var area = width * length;
  return area + " " + unit ;
}

Then when call the function, we pass it the three parameters(width, length, unit).

console.log(getArea(10, 20, 'sq ft'));

Running the code above would write "200 sq ft" to the console.

I hope that didn't confuse you. Let us know if you need more clarification. Thanks, Sean