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1 前言 Golang append加...用法缘由 2 代码 type Product struct { ID int64 `json:"id"` Name string `json:"name"` Info string `json:"info"` Price float64 `json:"price"` } var products []Product func initProducts() { product1 := Product{ID: 1, Name: "Chicha Morada", Info: "Chicha level (wiki)", Price: 7.99} product2 := Product{ID: 2, Name: "Chicha de jora", Info: "Chicha de sedays (wiki)", Price: 5.95} product3 := Product{ID: 3, Name: "Pisco", Info: "Pisco is a emakile (wiki)", Price: 9.95} products = append(products, product1, product2, product3) } func main() { initProducts() //如果没有省略号,如下,会提示: //Cannot use 'products[i+1:]' (type []Product) as type Product, Inspection info: Reports incompatible types. //products = append(products[:i],products[i+1:]) //正确用法 products = append(products[:i],products[i+1:]...) } 分析:这是append内置方法的定义 // The append built-in function appends elements to the end of a slice. If // it has sufficient capacity, the destination is resliced to accommodate the // new elements. If it does not, a new underlying array will be allocated. // Append returns the updated slice. It is therefore necessary to store the // result of append, often in the variable holding the slice itself: // slice = append(slice, elem1, elem2) // slice = append(slice, anotherSlice...) // As a special case, it is legal to append a string to a byte slice, like this: // slice = append([]byte("hello "), "world"...) func append(slice []Type, elems ...Type) []Type |
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