swift 一疑问：reduce

发布时间：2020-12-14 01:56:47 所属栏目：百科来源：网络整理

导读：var products = [ Product(name: "Kayak",description: "A boat for one person",price: 275,stock: 10), Product(name: "Lifejacket",description: "Protective and fashionable",price: 48.95,stock: 14), Product(name: "Soccer Ball",description: "FIFA-

var products = [
Product(name: "Kayak",description: "A boat for one person",price: 275,stock: 10),
Product(name: "Lifejacket",description: "Protective and fashionable",price: 48.95,stock: 14),

Product(name: "Soccer Ball",description: "FIFA-approved size and weight",price: 19.5,stock: 32)];

func calculateTax(product:Product) -> Double {
return product.price * 0.2;

}

//这个函数是什么意思？

func calculateStockValue(productsArray:[Product]) -> Double {
return productsArray. reduce(0,{(total,product) -> Double in return total + (product.price * Double(product.stock)) }); }

（编辑：李大同）

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