let a = 3;
a*=3;
--a;
++a;
let b = -a + 30;
b-=1
b/=2
b+=1;
b--;
b++;
let cKey = "c key";
let c = { a: { b: [a, b], [cKey]: 2 } }
let {d, e, f} = {d: 2, e: 2, f: 1}
// updating binding value
$.context.f = 1
c.a.b[0] = c.a.b[0] + d
c.a.b[1] = c.a.b[1] + e
c.a."c key" = c.a."c key" + f
c.a[cKey] = c.a[cKey] + ~s $.context.f
c