Double不能附加到AnyObject數組？

Question

我試圖將一個Double類型變量operand添加到AnyObject的數組中。

private var internalProgram = [AnyObject]() 
internalProgram.append(operand) 

但是，顯示Argument type 'Double' does not conform to expected type 'AnyObject'。我必須投operand作爲AnyObject？

Answer 1

let numberOperand = NSNumber(double: operand) 
yourArrayOfAnyObject.append(numberOperand)