2.js

// Predict and explain first BEFORE you run any code...

// this function should square any number but instead we're going to get an error

// =============> write your prediction of the error here
// the function parameter cannot be a number, or start with a number, follows same rules as variable names
// num is undefined.

// function square(3) {
//     return num * num;
// }

// =============> write the error message here
//SyntaxError: Unexpected number

// =============> explain this error message here
// function parameter is a number, which is not a valid type for parameters

// Finally, correct the code to fix the problem

function square(num) {
  return num * num;
}