Error: [variable] is not defined

Question

function diceNum(n) {
rect = document.getElementsByTagName("rect");
//rect.length == 9;
if (n == 1) {
for (x = 0; x < rect.length; x++) {
if (x == 4) {rect[x].style.fill = "black"}
else {rect[x].style.fill = "white";}
}
}
if (n == 2) {
for (x = 0; x < rect.length; x++) {
if (x == 2 || x == 6) {rect[x].style.fill = "black";}
else {rect[x].style.fill = "white";}
}

if (n == 3) {
for (x = 0; x < rect.length; x++) {
if (x == 2 || x == 4 || x == 6) {rect[x].style.fill = "black";}
else {rect[x].style.fill = "white";}
}
}
}
//output n is not defined line: 'if (n == 1) {'

Answer 1

yes, or just:

var n;

Answer 2

oh, thank you

Answer 3

it's just a part of my code.

Answer 4

It's become variable 'n' dose not exist on the code but only in the function 'diceNum', but i think the first '}' is miss placed in your code.

Answer 5

n can be used only in the function if you wanna use it out of it you have to return it , and something else why you declare a function while you didn't use it?

Answer 6

if you want to avoid "not defined problèms" or use and modify à variable in a function without having to systematicaly have go return it, you can déclaré it outside of your function with a null value for exemple. For exemple :
Var n = null;
function myfunction(){
n = 10;
n++;
}
myfunction ()
console.log(n)
This code wil print in thé console 11