Home > Article > Backend Development > Here are a few title options, aiming for a question format that captures the essence of the article: Option 1 (Focus on the \"how\" and the problem): * How to Capitalize the First Letter
Capitalizing the Initial Letter of a String in Go
Capitalizing the first letter of a string requires a nuanced approach that considers UTF-8 encoding and uppercase conventions. To address this, Go provides several options.
Rune-Based Approach: Most Performant
For optimal performance, use the utf8.DecodeRuneInString function to decode the first rune in the string:
<code class="go">r, size := utf8.DecodeRuneInString(text) if r == utf8.RuneError { // handle error } s = string(unicode.ToUpper(r)) + text[size:]</code>
This method effectively capitalizes the first rune and reassembles the rest of the string without breaking its encoding.
Rune Slice Approach
Another approach involves converting the string to a slice of runes, modifying the first rune, and converting it back to a string:
<code class="go">r := []rune(s) r[0] = unicode.ToUpper(r[0]) s = string(r)</code>
One-Liner Approach
A concise one-liner option:
<code class="go">s := string(append([]rune{unicode.ToUpper(r[0])}, r[1:]...))</code>
**ToUpper vs. To
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