2.js

// Predict and explain first BEFORE you run any code: the function is supposed to return the square of the number.

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

// =============> write your prediction of the error here: Maybe because we used a number instead of a variable inside the function declaration.

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

// =============> write the error message here : syntax error: Unexpected number (3)

// =============> explain this error message here: we shouldn't use a number as a parametre name of the function.

// Finally, correct the code to fix the problem

// =============> write your new code here
function square(num) {
    return num*num;
}
console.log(square(3));