Casting go array using type alias

In the Go language, casting an array using type aliases is a common operation. Type aliases create a new name for an existing type to facilitate type conversion. By using type aliases we can convert an array to an array of another type. This conversion operation is very simple in the Go language and can effectively improve the readability and maintainability of the code. In this article, we will introduce how to cast a Go array using type aliases and provide some examples to help readers better understand this concept.

Question content

Suppose I have a defined type bytes which is a byte array as shown below. Is there an easy way to convert an array of byte arrays to a byte array and vice versa?

package main

type Bytes []byte

func main() {
    x := make([][]byte, 3)
    y := ([]Bytes)(x)
}

Solution

No, unfortunately, go does not allow direct conversion between different types, even if they are aliases. Aliasing is more like giving an existing type a new name, but it doesn't provide any form of automatic conversion.

You need to manually iterate over [][]byte and convert each []byte to type bytes.

The specific operation methods are as follows:

package main

import "fmt"

type Bytes []byte

func main() {
    x := make([][]byte, 3)
    // Initializing byte slices for demonstration purposes
    for i := range x {
        x[i] = []byte{byte(i), byte(i+1)}
    }

    y := make([]Bytes, len(x))
    for i, v := range x {
        y[i] = Bytes(v)
    }

    fmt.Println("Hello, 世界", y)
}

This code manually iterates x, converting each []byte into a byte and placing it at the corresponding position in y.

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