How to Convert Fixed Size Arrays to Variable Sized Arrays in Go?

Converting Fixed Size Arrays to Variable Sized Arrays in Go

One common challenge developers encounter in Go is converting fixed size arrays to variable sized arrays, known as slices. This conversion can be achieved with a simple technique.

Consider the following example:

package main

import (
    "fmt"
)

func main() {
    var a [32]byte
    b := a[:] // Note the syntax used here
    fmt.Printf(" %x", b)
}

In this example, we have a fixed size array a of type [32]byte. We want to convert this array to a slice b of type []byte. The key to this conversion lies in the assignment statement:

b := a[:]

The colon ([:]) operator creates a slice that spans the entire length of the array. In other words, it creates a slice that references the same underlying data as the array.

When this code is run, it will print the hexadecimal representation of the contents of the slice, effectively converting the fixed size array a to the variable size array b.

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