How to Capitalize the First Letter of a String in Go?

Capitalizing the First Letter of a String in Go

In Go, you may encounter the need to capitalize the first letter of a given string. This operation involves converting the character at the string's beginning to uppercase. Several solutions are available in Go:

Unicode Conversion

The most performant approach involves converting the string to a rune slice, replacing the first rune with its capitalized version, and converting it back to a string. This method handles multi-byte characters and languages with different capitalization rules:

<code class="go">s := "the biggest ocean is the Pacific ocean"

r := []rune(s) // Convert string to a rune slice
r[0] = unicode.ToUpper(r[0]) // Capitalize the first rune
s = string(r) // Convert rune slice back to string</code>

Rune Decoding

An alternative method uses utf8.DecodeRuneInString to read the first rune of the string and unicode.ToUpper to capitalize it. This approach is similar to the unicode conversion method in performance:

<code class="go">r, size := utf8.DecodeRuneInString(s)
if r == utf8.RuneError { return } // Handle invalid UTF-8
s = string(unicode.ToUpper(r)) + s[size:]</code>

Other Considerations

• **ToUpper vs. To

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