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

// For function square the variable inside the parameter will have a error, because number cant be used when name a variable and num variable is undefine.
/*
function square(3) {
    return num * num;
}
*/
// =============> write the error message here
// SyntaxError: Unexpected number

// =============> explain this error message here
//Because number cant be used when name a variable.

// Finally, correct the code to fix the problem

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

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