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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