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How to iterate byte elements in a string?

In Go, strings are assumed as UTF-8 encoded. for-range over a string will get the runes (Unicode code points) in the string. Then how to get the byte elements in a string? There are two ways to achieve this. The performance of these two ways is substantially equivalent.

Way 1: use for;; loop

	for i := 0; i < len(aString); i++ {
		byteElement := aString[i]
		... // use byteElement
	}

Way 2: use for-range loop

The official Go compiler makes special optimizations so that memory allocation and bytes duplication don't happen in a conversion []byte(aString) if the result byte slice (of the conversion) is proven not to be used concurrently. For example, the conversion following the range keyword doesn't allocate and duplicate the underlying bytes. 

	for _, byteElement := range []byte(aString) {
		... // use byteElement
	}

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Tapir, the author of Go 101, has been on writing the Go 101 series books and maintaining the go101.org website since 2016 July. New contents will be continually added to the book and the website from time to time. Tapir is also an indie game developer. You can also support Go 101 by playing Tapir's games (made for both Android and iPhone/iPad):
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