Day race Javascript Question

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#1

I did the exercise like this. It’s not very clear why i need to write raceNumber+=1000 to the first statement. Somebody can explain me why?

let raceNumber = Math.floor(Math.random() * 1000);
const earlyRegistered = true;
const Age = 18;
if (Age > 18 && earlyRegistered) {
raceNumber+=1000; (this line)
}
if (Age > 18 && earlyRegistered === ‘true’) {
console.log('Partecipant ’ + raceNumber +‘th the race will start at 9:30 am’);
} else if (Age > 18 && earlyRegistered === false) {
console.log('Partecipant ’ + raceNumber +‘th the race will start at 11:00 am’);
} else if (Age < 18) {
console.log('Partecipant ’ + raceNumber +‘th the race will start at 12:30 pm’);
} else {
console.log(‘Approach the registration’)
}

#2

Race numbers are often divided over the different distances, so for example 1 till 1000 could be 5km, 1000 till 2000 could be 10km and 2000 till 3000 could be for 21km

It seems in this exercise pre-registration are thousand and higher, while people who sign up on the day itself get the number 1 till 1000.

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#3

So it means that the code will take just the first 1000 people right?

#4

no, it means if you did pre-registration your start number will be higher then 1000 (given we increased it with 1000)

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#5

but when i try it the number that comes out is within 0 and 1000, not higher than 1000

here it’s the exercise:
Here’s how our registration works. There are adult runners (over 18 years of age) and youth runners (under 18 years of age). They can register early or late. Runners are assigned a race number and start time based on their age and registration.

Race number:

  • Early adults receive a race number at or above 1000.
  • All others receive a number below 1000.

Start time:

  • Adult registrants run at 9:30 am or 11:00 am.
    • Early adults run at 9:30 am.
    • Late adults run at 11:00 am.
  • Youth registrants run at 12:30 pm (regardless of registration).

But we didn’t plan for runners that are exactly 18! We’ll handle that by the end of the project.

#6

age variable is set to 18, while the condition checks for age greater then 18

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#7

so it means if i am over 18 and i register early i will have a number over 1000
otherwise i will have a number within 1000
is that right?

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#8

yes, that is right.

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#9

Ok thank you @stetim94 :smiley:

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#10

what is gonna be the correct syntax ? worked in both way :nerd_face:
#1
if ((registredEarly) && (runnerAge > 18)){ }

#2

if (registredEarly && runnerAge > 18){ }

#11

Both are fine, but the extra parenthesis in #1 are unnecessary as evidenced by the fact that #2 works just as well. I’d leave them out.

#12

second is kinda JAVA syntax the first is JS syntax?

#13

Either syntax is pretty universal for many languages (JavaScript, Java, C++, C# & maybe more). Like I said, I would leave the extra parenthesis out because they aren’t needed, but it’s really programmer preference. If you had complex expressions on either side of the &&, you might add the parenthesis for readability, but they’d still be unnecessary.

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