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

// =============> In the parameters of function we can write the name of the variable but not the actual value.
//we write actual value when we call the function.

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

// =============> write the error message here
/*
function square(3) {
                ^

SyntaxError: Unexpected number
*/

// =============> Yeah, the error is because that when writing the function it does not expect number value instead of the parameter name

// Finally, correct the code to fix the problem

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

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