45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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// For more tutorials : https://learngoprogramming.com
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// In-person training : https://www.linkedin.com/in/inancgumus/
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// Follow me on twitter: https://twitter.com/inancgumus
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package main
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import (
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"bytes"
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"fmt"
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"unicode/utf8"
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)
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func main() {
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word := []byte("öykü")
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fmt.Printf("%s = % [1]x\n", word)
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// how to make the first rune uppercase?
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// you need to find the starting and ending position of the first rune
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// 1st way: `for range`
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// you can't get the runes by range overing a byte slice
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// first, you need to convert it to a string
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var size int
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for i := range string(word) {
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if i > 0 {
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size = i
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break
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}
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}
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// 2nd way: let's do it using the utf8 package's DecodeRune function
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_, size = utf8.DecodeRune(word)
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// overwrite the current bytes with the new uppercased bytes
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copy(word[:size], bytes.ToUpper(word[:size]))
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// to get printed bytes/runes need to be encoded in a string
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fmt.Printf("%s = % [1]x\n", word)
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}
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