swift 2.2 闭包 语法问题

Question

按照书本写了以下代码，但貌似因为所用swift版本（我的环境是Xcode7.3）不同导致了一点语法错误，没有想到头绪……

let simpleInterestCalculationClosure = { (loadAmmon : Double, var interestRate : Double, years : Int) -> Double in
//警告1:'var' parameters are deprecated and will be remove in swift 3 fix-it Delete "var"

    interestRate = interestRate / 100.0
    //错误2: Cannot assign to value: 'interestRate' is a 'let' constant
    
    var interest = Double(years) * interestRate * loadAmmon
    
    return loadAmmon + interest
}

但是删除了var之后会出现错误2

Answer 1

参数的语法变了

var的地方改成inout应该就可

Answer 2

使用inout来使参数在函数/闭包内可变