How Do I Convert a Go Array to a Slice?

Converting Array to Slice in Go

When working with arrays and slices in Go, there may be instances where you need to convert an array to a slice for further processing. For example, you have a function that returns an array but another function requires a slice as an input parameter.

To address this need, it is possible to convert an array to a slice using the slice expression array[:]. This expression effectively creates a slice header pointing to the underlying array without creating a copy of the data.

Here's an example that demonstrates how you can achieve this:

func Foo() [32]byte {
    return [32]byte{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}
}

func Bar(b []byte) {
    fmt.Println(string(b))
}

func main() {
    x := Foo()
    Bar(x[:])
}

In this example, the Foo function returns an array of 32 bytes, representing the digits '0' to 'f'. The Bar function accepts a slice of bytes and prints its string representation.

When you call Bar(x[:]), you are creating a slice header that references the underlying array x without copying the data. The [:] expression essentially creates a slice that starts at the beginning and ends at the last element of the array.

It is important to note that this conversion does not create a copy of the underlying data, but instead provides a different view or reference to the same data. This can be particularly useful when you need to pass data between functions without creating unnecessary copies.

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