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

// =============> I think that return can only return a value not do a calculation 
// so this will return an error because it is trying to do a calculation instead of returning a value

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

// =============> SyntaxError: Unexpected number

// =============> this is because variables and parameters in functions cannot start with a number or be a number
// however, return can be used for calculations so my prediction was wrong

// Finally, correct the code to fix the problem

// function square (num) {
//   return num * num;
// }
// console.log(square(5));

// ran console.log to ensure it works