Applying Strings, Arrays and Slices

Making a slice of bytes or runes from a string

A string in memory is, in fact, a 2 word-structure consisting of a pointer to the string data and the length. The pointer is completely invisible in Go-code. For all practical purposes, we can continue to see a string as a value type, namely its underlying array of characters. If s is a string (so also an array of bytes), a slice of bytes c can immediately be made with

c:=[]byte(s)

This can also be done with the copy-function:

copy(dst []byte, src string)

The for range can also be applied as in the following program: