javascript-async-sample.js

var a = 0;

console.log("Line 3, a =", a);

var fun1 = (() => {
  console.log("fun1, Line 6, a =", a);
})

var fun2 = (() => {
  console.log("fun2, Line 10, a =", a);
  a++;
  console.log("fun2, Line 12, a =", a);
});

fun1();

setTimeout(()=> {
  console.log("setTimeout callback, Line 18, a =", a);
  a++;
  console.log("setTimeout callback, Line 20, a =", a);
  fun2();
}, 1000)

fun1();