[swift-evolution] ternary operator ?: suggestion

[Jo Albright]

> On Jan 8, 2016, at 2:36 AM, Craig Cruden via swift-evolution <swift-evolution at swift.org> wrote:
> 
>>> let commission = trade.map {
>>> 	case .Buy(let quantity, let price) where Double(quantity) * price > 10000 in
>>>     		Double(quantity) * price * vipCommissionRate / 100
>>> 	case .Buy(let quantity, let price) in
>>>     		Double(quantity) * price * commissionRate / 100
>>> 	case .Sell(let quantity, let price) where Double(quantity) * price > 10000 in
>>>     		Double(quantity) * price * vipCommissionRate / 100
>>> 	case .Sell(let quantity, let price) in
>>>     		Double(quantity) * price * commissionRate / 100
>>> }

Is there any reason it couldn’t be “switchMap” instead of “map”? Would follow the design of “flatMap” naming. It would also help explain what is happening by mapping based on a switch statement.

let commission = trade.switchMap {

    case .Buy(let quantity, let price) where Double(quantity) * price > 10000 in
    		Double(quantity) * price * vipCommissionRate / 100
    case .Buy(let quantity, let price) in
    		Double(quantity) * price * commissionRate / 100
    case .Sell(let quantity, let price) where Double(quantity) * price > 10000 in
    		Double(quantity) * price * vipCommissionRate / 100
    case .Sell(let quantity, let price) in
    		Double(quantity) * price * commissionRate / 100

}


 Nerd . Designer . Developer
Jo Albright


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