export func main() {
  let three = 3
  let two = 2

  let calculateSimple = { in
    (50 + three) * two
  }

  let calculateComplex = { in
    three + two + 50
  }

  let multiply = { a, b in
    a * b
  }

  // calculates the result
  let calculateSimpleResult = calculateSimple()
  let calculateComplexResult = calculateComplex()
  let multiplyResult = multiply(50, 50)

  let list = [10, 20, 30]
  let trueValue = true
  let falseValue = false

  let invert = { value in
    !value
  }

  let notEqual = { a, b in
    a != b
  }

  let equal = { a, b in
    a == b
  }

  let results = [
    calculateSimpleResult,
    calculateComplexResult,
    multiplyResult,
    list,
    trueValue,
    falseValue,
    invert(true),
    invert(false),
    equal(5, 5),
    equal(5, 6),
    notEqual(5, 5),
    notEqual(5, 6)
  ]

  println("results:")
  println(results)
}