Combining the first name, last name, and code in Javascript

I'm attempting to combine the initial letter of both names with the randomly generated code.

   var firstname = prompt("Please input your first name.");
   var lastname = prompt ("Please input your last name.");

   if (amountCorrect >= 4){
            alert("Your store login Code is: " + str(firstname,1,1) + str(lastname,1,1) + (generateCode())); // Execute the generateCode function
        }
        else{
            alert("You didn't pass this time. You will be redirected back to the homepage.");
            window.history.go(-1); // Navigate back one step
        }
    }

    function generateCode(){

    var text        = "";
    var possible    = "0123456789";

    for( var i=0; i < 4; i++ ){
        text += possible.charAt(Math.floor(Math.random() * possible.length));   
    }

    return text;
}

Answer №1

Your alert line is missing a definition for 'str'.

alert("Your store login code is: " + firstname[0] + lastname[0] + (generateCode()));

The suggested corrections have been made. Please note the extraneous } after the if block. It is advisable to implement additional error checking for user input to avoid issues with undefined values in the generated code.

Answer №2

To extract the initial character, simply utilize the substring function:

alert("The login Code assigned to you is: " + firstname.substring(0,1) + lastname.substring(0,1) + (generateCode()));

Refer to this documentation for more details on String.prototype.substring.

Answer №3

Make a modification to the line

alert("Your login Code for the store is: " + firstname.substring(1, 0) + lastname.substring(1, 0) + (generateCode())); // Call the generateCode function

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