How Can I Convert a Go Array to a Slice?

Converting Arrays to Slices in Go

When working with arrays and slices in Go, it may be necessary to convert between the two data types. This can be useful when passing data between functions that expect different types of input.

Suppose you have a function that returns an array of bytes:

func Foo() [32]byte { ... }

You may need to pass that result to another function that expects a slice of bytes:

func Bar(b []byte) { ... }

If you simply try to call Bar(d) where d is the array returned by Foo, you will get a type conversion error. This is because arrays and slices are different types in Go.

To convert an array to a slice, you can use the [:] syntax. This will create a slice that references the underlying array data. For example:

d := Foo()
Bar(d[:])

This will pass a slice of the data from the array d to the function Bar. The slice will reference the same underlying buffer as the array, so no data copying will occur.

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