A question about a challenge question

Question

var a = {
atr:12
};

var b = 37;
function change(obj,x){
x++;
a.atr++;
}
change(a,b);

console.log(a.atr + "" + b);

I couldn't understand why a.atr is not 38. Because when I do try to increment the object a within a function, the property inside the object a increases properly. Could you tell me the reason behind that?

Thanks

Answer 1

//well... Its logic
var a {
atr:12
};
//global variable
var b=37; //also global
function change(obj,x){
x++; //x is a local variable and has no influence at anything
a.atr++;//increasing atr of a from 12 to 13
}
change(a,b); //making x inside the function have the value of b, wont help x influence b because they dont say b++
console.log(a.atr+""+b);
//output 1337 13 from a.atr and 37 from b since it is not changed

Answer 2

~Just Another Brick In The Wall~
I just figured this out: you can put ; as many as you want

int x=5;;;;;;;;;;;
and it works 😁

(works in java, probably works in other languages)

Answer 3

var a{
atr:12
};

why would you put ; after { ?
Isn't that unnecessary or maybe there's a reason?

Answer 4

it's unneccessary but in this case used to confuse people with the values of a and a.atr

Answer 5

I think I am confused a bit about the value of variable and property. a.atr can't be 38. It is 12. It can be 13. 😂 Thank you ~Just Another Brick In The Wall~

Answer 6

Joseph Hardrock I think this question is ment to let you be confused with variables, their names, values, and how the last ones are changed

Answer 7

Voja lol but I didn't read your question correct I thought you asked why they put curly brackets and atr inside it

Answer 8

btw a semicolon remembers a program that it is the end of the statement line
so what you are saying to the program is
int x = 5 //New codeline
//New codeline
//New codeline
//New codeline
//New codelin
etc .....

Answer 9

Maybe the confusion was generated by the differences between languages?

In Python you can define some container object like arr = [] and throw stuff in there with arr.append(x) even from a function, while you can't reassign (arr = 'whatever').

Answer 10

In javascript you can also define a container object like var arr = [] and arr.push() and way more, but there is a difference here. A has (I think) the value { atr:12 } if you alert or console.log it, but if you alert or console.log an array, it will output just values separated with commas, even when you stack arrays like arr = [a [ b ] [e [ c ] [ d ] ] ] but if I alert arr[2], even though there are other values stored in it, it will output e but when I alert a.atr, it can have other values and maybe even another container like that so you can do a.atr.anotheratr.anotherthirdatr etc. and store huge amounts of values