提示参数

问题

函数被可变数量的参数所调用。

解决方案

使用splat 。

loadTruck = (firstDibs, secondDibs, tooSlow...) ->
    truck:
        driversSeat: firstDibs
        passengerSeat: secondDibs
        trunkBed: tooSlow

loadTruck("Amanda", "Joel")
# => { truck: { driversSeat: "Amanda", passengerSeat: "Joel", trunkBed: [] } }

loadTruck("Amanda", "Joel", "Bob", "Mary", "Phillip")
# => { truck: { driversSeat: "Amanda", passengerSeat: "Joel", 
trunkBed: ["Bob", "Mary", "Phillip"] } }

使用尾部参数：

loadTruck = (firstDibs, secondDibs, tooSlow..., leftAtHome) ->
    truck:
        driversSeat: firstDibs
        passengerSeat: secondDibs
        trunkBed: tooSlow
    taxi:
        passengerSeat: leftAtHome

loadTruck("Amanda", "Joel", "Bob", "Mary", "Phillip", "Austin")
# => { truck: { driversSeat: 'Amanda', passengerSeat: 'Joel', 
trunkBed: [ 'Bob', 'Mary', 'Phillip' ] }, taxi: { passengerSeat: 'Austin' } }

loadTruck("Amanda")
# => { truck: { driversSeat: "Amanda", passengerSeat: undefined, trunkBed: [] }, 
taxi: undefined }

讨论

通过在函数其中的（不多于）一个参数之后添加一个省略号（...）， CoffeeScript能把所有不被其他命名参数采用的参数值整合进一个列表中。

没有提供命名参数也会制造一个空列表。