Error in JavaScript

Question

Heeeeelp... I don't know why, but it doesn't work.

https://code.sololearn.com/ct0zw7757cBx/?ref=app

Answer 1

ㅤㅤㅤ ,

i am not sure if you are aware, that there are 2 different ways, how and when the increment / decrement will be done:

>>> increment operators:

> a++ is called *post increment*. when using this notation, the value of *a* is used as it is, maybe in an expression, and increment is done *after* this.

++a is called *pre increment*. when using this notation, the value of *a* will be incremented first, and then is maybe used in an expression.

According to the description above, the decrement is also carried out in this way.

Answer 2

console.log(arr[a][b]);
console.log('\nTest');
a++; b++;
console.log(arr[a][b]);
b-=2;
console.log(arr[a][b]);

Or

console.log(arr[a][b]);
console.log('\nTest');
console.log(arr[++a][++b]);
console.log(arr[a][b-=2]);

Answer 3

Eduardo Bresolin
It works, thanks!

Answer 4

Lothar
Yes... but... it has decreased, not increased. And this is not normal...