--- (1) ---
Mozilla

--- (2) ---
2

--- (3) ---
ReferenceError: y is not defined
    at Object.<anonymous> (E:\Angular\JS\Basic\Closure.js:38:17)
    at Module._compile (node:internal/modules/cjs/loader:1256:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1310:10)
    at Module.load (node:internal/modules/cjs/loader:1119:32)
    at Module._load (node:internal/modules/cjs/loader:960:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:23:47

--- (4) ---
Mozilla

--- (5) ---
7
12

--- (6) ---
0
2
1

--- (7) ---
0
2
1
0

--- (8) ---
20

--- (9) ---
20

--- (10) ---
undefined
6

--- (11) ---