Change a value from 0->1 or 1->0 with only mathematic operations

Question

I have a variable on javascrit, initialized at 0. What I'd like to do is this :

• if the value is 0, change it to 1;
• if the value is 1, change it to 0;

and I'll avoid conditional statement (like if/else) to check what the value is.

I think I just do it with some matematic operation; I thought to a NOT operation, but I don't know how to do that operation without

Answer 1

x = 1-x;

Answer 2

you can use xor operator:

x = x XOR 1;

Answer 3

Short XOR syntax:

x ^= 1

Swaps 0 to 1 and 1 to 0.

Answer 4

Here is another notation, it also changes true, false to 1, 0.

x = +x;

If you want to switch the value

x = +!x;

Answer 5

If the variable is let's say i

i = 1 - i, should do the trick

if i = 0, 1 - 0 = 1 than i = 1

if i = 1, 1 - 1 = 0 than i = 0