while on array unexpected behavior

[espace]

hi,

I have a gameProgress (e) where each position in my array are stars (1,2) or blocked levels (-1)

I want to count the position of the blocked level so i use this ;

var e=[1,2,1,1,-1];
var n = 0;

while (e[n] < 0) {
n++;
var position=n;
}

console.log(position);
// expected output: 4 and result is 3 ???

but the result is not 4 => e=[1,2,1,1,-1] could you tell me why ?

[in mono]

Just swap the increment step with the next line.

[espace]

sorry but i don't understand very well ....i do that but it's not true :

var e=[1,2,1,1,-1];
var n = 0;

while (e[n] < 0) {
var position=n;
n++;
}

console.log(position);
// undefined

[espace]

find by myself

var n = 0;
var e=[0,2,1,-1]
while (e[n] != -1) {
  n++;
}

console.log(n);
// 3

 

[mkardas91]

var e=[0,2,1,-1]
console.log(e.indexOf(-1));
// 3

https://developer.mozilla.org/pl/docs/Web/JavaScript/Referencje/Obiekty/Array/indexOf