Kevin Powell - Community•17mo ago

JS – why is it printing?

Hi! Just taking my first babysteps into JS with codecademy. Could someone tell me why the else statement prints in this example when the runnersAge is set to anything except 18?

let raceNumber = Math.floor(Math.random() * 1000);

const earlyRegister = true;
let runnersAge = 16;

if (runnersAge > 18 && earlyRegister) {
  raceNumber += 1000;
}

if (runnersAge > 18 && earlyRegister) {
  console.log(`Hello, runner number ${raceNumber}. You're start time is 9.30 am.`);
} else if (runnersAge > 18 && !earlyRegister) {
  console.log(`Hello, runner number ${raceNumber}. You're start time is 11.00 am.`);
} else if (runnersAge < 18)
  console.log(`Hello, runner number ${raceNumber}. You're start time is 12.30 am.`);
  else (runnersAge === 18)
  console.log(`Hello! Since you're 18, please see the registration desk.`);

let raceNumber = Math.floor(Math.random() * 1000);

const earlyRegister = true;
let runnersAge = 16;

if (runnersAge > 18 && earlyRegister) {
  raceNumber += 1000;
}

if (runnersAge > 18 && earlyRegister) {
  console.log(`Hello, runner number ${raceNumber}. You're start time is 9.30 am.`);
} else if (runnersAge > 18 && !earlyRegister) {
  console.log(`Hello, runner number ${raceNumber}. You're start time is 11.00 am.`);
} else if (runnersAge < 18)
  console.log(`Hello, runner number ${raceNumber}. You're start time is 12.30 am.`);
  else (runnersAge === 18)
  console.log(`Hello! Since you're 18, please see the registration desk.`);

29 Replies

Å Marlon G•17mo ago

And ... is there a codepen equivalent for JS, where you can just paste an URL for these types of questions and not copy paste from VS all the time?

Wolle•17mo ago

Your last else has an assertion, but no if. That may cause the problem. Do you have any errors in your console?

Unknown User•17mo ago

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CodeNascher•17mo ago

and not copy paste from VS all the time?

You can also drag your js file into VSCode

Å Marlon G•17mo ago

No, no errors. This is what is printed:


Hello, runner number 825. You're start time is 12.30 am.
Hello, runner number 825. Please see the registration desk for starting time.

How do you 'run' the code in codepen? I get the console, but no run button if I want to test changes to code

Wolle•17mo ago

I guess this line: else (runnersAge === 18)gets ignored, so the line below it gets printed everytime.

CodeNascher•17mo ago

my guess as well

Å Marlon G•17mo ago

But if I change the runnersAge to 18, then only that line is printed ...

Wolle•17mo ago

It gets printed no matter the input. Either put a if in there, or remove the assertion

Unknown User•17mo ago

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Å Marlon G•17mo ago

Aha ... So then I'll maybe use JSFiddle when I only have JS questions since arun button is nice then, and auto is noce for HTML and CSS. 👍 Ok. So since I'm a total newbie. What's the assertion? This articel is a bit overwhelming to be honest ... https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Assertions

CodeNascher•17mo ago

else is the final condition. it has no check

Mannix•17mo ago

else isn't suppose to have a condition

Wolle•17mo ago

I mean the thing inside the if brackets. (is assertion the right word for that? sry, english isn't a language I use everyday)

Unknown User•17mo ago

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Mannix•17mo ago

if (runnersAge > 18 && earlyRegister) {
  console.log(`Hello, runner number ${raceNumber}. You're start time is 9.30 am.`);
} else if (runnersAge > 18 && !earlyRegister) {
  console.log(`Hello, runner number ${raceNumber}. You're start time is 11.00 am.`);
} else if (runnersAge < 18)
  console.log(`Hello, runner number ${raceNumber}. You're start time is 12.30 am.`);
  else {
  console.log(`Hello! Since you're 18, please see the registration desk.`)};

if (runnersAge > 18 && earlyRegister) {
  console.log(`Hello, runner number ${raceNumber}. You're start time is 9.30 am.`);
} else if (runnersAge > 18 && !earlyRegister) {
  console.log(`Hello, runner number ${raceNumber}. You're start time is 11.00 am.`);
} else if (runnersAge < 18)
  console.log(`Hello, runner number ${raceNumber}. You're start time is 12.30 am.`);
  else {
  console.log(`Hello! Since you're 18, please see the registration desk.`)};

that's how it suppose to look

Unknown User•17mo ago

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Å Marlon G•17mo ago

Yes! Removing the else condition works, and obvioulsy makes sense. This is what is challenging ... you have to explain all possibilities, but at some point you don't. When is that point? 😅 With time ... Thank you so much!

Unknown User•17mo ago

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Å Marlon G•17mo ago

Aha ... that is not explained in the course. So then the last condition would be like this?

else if (runnersAge === 18) {
  console.log(

Hello! Since you're 18, please see the registration desk.)};

Unknown User•17mo ago

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Å Marlon G•17mo ago

https://tenor.com/view/clapping-standing-ovation-gif-5157815

Tenor

Å Marlon G•17mo ago

@omaj That's extremely helpful! Thank you very much! You win todays 🦚

Unknown User•17mo ago

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Å Marlon G•17mo ago

Trying to write it concise. Is this a correct summary?

End with an else if you always want a final outcome but don't necessarily need a condition matching your values, and else-if if you want to see all conditions in play

Unknown User•17mo ago

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Å Marlon G•17mo ago

... oh, and final point then - this example also apllies to the switch operation and default in there ...

Unknown User•17mo ago

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Å Marlon G•17mo ago

Well then. Today I became more knowladgeable. Thank you again! You get another 🦚 😎

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JS – why is it printing?