ucuseless code

function a() {
  b()
}
function b() {
  a()
}

if (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) {
  console.log(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
}

function a(x) {
  return x
}
console.log(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(a(0)))))))))))))))))))))))))))))))))

f()
function f() {
  return true
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
  return false
}

function f() {
  return true
  return false
  return false
}
f()

{{{([])}}}
([[({})]])
{{{{{}}}}}
([[[[]]]])
[([({})])]
{{{[[]]}}}
(((([]))))

(function() {
  return (function() {
    return (function() {
      return function() {
        return (function() {
          return (function() {
            return function() {
              return function() {
                return function() {          
                  console.log(0)
                }
              }
            }
          })()
        })()()
      }
    })()
  })()()
})()()()