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JavaScript

Posted by ab199
.a{fill-rule:evenodd;}techdegree
ab199
Full Stack JavaScript v2 Techdegree Student 17,446 Points

What is wrong with my code? (JavaScript Basics: Stage 2 - Challenge)

var noun = prompt("Enter a noun: ");

var verb = prompt("Enter a verb: ");

var adjective = prompt("Enter an adjective: ");

var sentence = "<h2>I am a " + noun;

sentence += " that is " + verb;

sentence += " on a " + adjective + " day.</h2>";

document.write(sentence);

Brackets, the text editor, is giving me the following errors:

2 JSLint Problems
×
1   'prompt' was used before it was defined.    var noun = prompt("Enter a noun: ");
7   document.write can be a form of eval.   document.write(sentence);

What are these errors?

1 Answer

Marcus Parsons
Marcus Parsons
15,719 Points

Hey Yan,

It's not that your code is wrong per se, but JSLint is saying that prompt and document.write should not be used in production code. If you go to http://www.jslint.com and paste your code into the text area, and then at the very bottom of the page click "In development" under the "Assume" category, you'll see your errors go away. These types of functions are only meant to be used to test code (development mode) which is what you're doing.

In fact, if you use jQuery at all, JSLint will pop up with so many errors, your head will spin. It will say a vast array of things are undefined, no pun intended. JSLint only scans the code of the page it is currently on, so it can't take into account that there might just be other scripts defined before this one that give you some awesome tools such as the jQuery library. It's not the best method of testing code, but it is good for testing small blocks of pure JavaScript that don't have to work with any other scripts.

ab199
.a{fill-rule:evenodd;}techdegree
ab199
Full Stack JavaScript v2 Techdegree Student 17,446 Points

Thanks a lot, Marcus!

Marcus Parsons
Marcus Parsons
15,719 Points

You're welcome, Yan! I saw where you marked this as best answer, but now it's not for some reason?