[Solved] How is this 15?

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  1. The call to doSomething() is made, with 2 as the parameter (bound to a in the function).
  2. The call to doSomethingElse() is made, with 4 (a * 2) as the parameter, bound to the symbol a in that inner function.
  3. The inner function returns 3 (a - 1).
  4. The doSomething() function then adds its a (still 2) to the result, giving 5, and assigns that to b.
  5. The console.log() call is made, with 15 as the argument (b * 3).

solved How is this 15?