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
// line 9 num is not defined.

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

// =============> write the error message here
// SyntaxError: Unexpected number
// =============> explain this error message here
// 3 is not a variable for the function to use. It should be a variable name like num or n.
// Finally, correct the code to fix the problem

// =============> write your new code here

function square(num) {
    return num * num;
}
console.log(square(3));