2.js

// Predict and explain first BEFORE you run any code...
// the function parameter is assigned to constant number the result will be variable error.
// this function should square any number but instead we're going to get an error

// =============> write your prediction of the error here : variable error.

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

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

// =============> explain this error message here
// the error message is explaining that the parameter is assigned to constant number rather than variable.

// Finally, correct the code to fix the problem

// =============> write your new code here : function square(num){
//                                               return num * num;
//                                           }