let a, b, c, d;
a = a || (a = 2);
a ||= 2;
a = a && (a = 2);
a &&= 2;
a = a ?? (a = 2);
a ??= 2;
b = 1 + 2;
b = 1 - 2;
b = 1 / 2;
b = 1 * 2;
c = 2 ** 1;
c = 1 % 2;
d = 1 << 2;
d = 1 >> 2;
d = 1 >>> 2;
d = 1 & 3;
d = 1 ^ 3;
d = 1 | 3;
a == b;
a === b;
a != b;
a !== b;
a > b;
a >= b;
a < b;
a <= b;
++a;
a++;
+a;
-a;
--a;
a--;