New to javascript - Variable "unexpected identifier"

#1

Why do I get an unexpected identifier?
my code:
let raceNumber = Math.floor(Math.random() * 1000);
let early = false;
let age = 18;
if age += true && early = true

Im on the race day project

#2

this line:

if age += true && early = true

could you explain to me how you think this line of code works?

1 Like
#3

if they both equal true. checking if they both are true

#4

first, the general syntax for if is the following:

if (condition) {
   // code to execute
}

in your case, all the brackets are missing. and += (incremental assignment) and = (assignment) are not comparison/equality operators.

1 Like
#5

How do I make it so if they are both true it changes the variable raceNumber by 1000. Heres what I did

let raceNumber = Math.floor(Math.random() * 1000);
let early = false;
let age = 18;
if(true) {
age && early
let raceNumber = raceNumber + 1000
}

And this error,

/home/ccuser/workspace/learn-javascript-U2P2/main.js:6
let raceNumber = raceNumber + 1000
^

ReferenceError: raceNumber is not defined
at Object. (/home/ccuser/workspace/learn-javascript-U2P2/main.js:6:21)

#6

@css4466983849 When referencing a variable for the second time, i.e. to change it, you do not need have let again. See the example below:

let variable1 = 3 //Here, I have declared the variable for the first time, so I *do* need *let*.
variable1 = 4//Here, because I have already declared a variable called 'variable1' , I do not need the let keyword. Same goes for const, or, in pre-ES6, var.

Then, for if…else, you need, at least for the age, a condition saying age is equal to 18. In JavaScript you can write it like this:

let variable = 2
const otherVariable = true
if (variable === 2 && otherVariable) { /* notice how there is the three equal signs (===)? This means 
  //code here                             equal to. You can also write otherVariable === true.*/
}

In your case, you need to have the equal signs for age. There are other operators as well:
‘!==’ is not equal to
‘>=’ is greater than or equal to
‘<=’ is less than or equal to
‘>’ is greater than
‘<’ is less than
I hope that made some sense to you!

#7

Well actually, a const variable cannot be reassigned.

const pet = 'dog'
pet = 'cat' // should give an error
#8

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