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For Hosts Locale how to convert a string to lowercase letters in JavaScript?
To convert a string to lowercase letters in JavaScript, use the toLocaleLowerCase() method. This method converts characters to lowercase according to the host's locale, making it ideal for international applications.
Syntax
string.toLocaleLowerCase([locale])
Parameters
locale (optional): A string specifying the locale to use for conversion. If omitted, the host environment's current locale is used.
Basic Example
Here's how to use toLocaleLowerCase() to convert a string to lowercase:
<!DOCTYPE html>
<html>
<body>
<script>
var str = "WELCOME TO TUTORIALSPOINT!";
document.write("Original: " + str + "<br>");
document.write("Lowercase: " + str.toLocaleLowerCase());
</script>
</body>
</html>
Original: WELCOME TO TUTORIALSPOINT! Lowercase: welcome to tutorialspoint!
Locale-Specific Conversion
The method becomes especially useful with specific locales that have unique lowercase rules:
<!DOCTYPE html>
<html>
<body>
<script>
var turkishStr = "?STANBUL";
document.write("Turkish locale: " + turkishStr.toLocaleLowerCase('tr-TR') + "<br>");
document.write("English locale: " + turkishStr.toLocaleLowerCase('en-US'));
</script>
</body>
</html>
Turkish locale: i?stanbul English locale: i?stanbul
Difference from toLowerCase()
While toLowerCase() uses Unicode mapping, toLocaleLowerCase() respects locale-specific rules:
<!DOCTYPE html>
<html>
<body>
<script>
var text = "MIXED TEXT 123!";
document.write("toLowerCase(): " + text.toLowerCase() + "<br>");
document.write("toLocaleLowerCase(): " + text.toLocaleLowerCase());
</script>
</body>
</html>
toLowerCase(): mixed text 123! toLocaleLowerCase(): mixed text 123!
Key Points
- The original string remains unchanged (strings are immutable)
- Returns a new string with lowercase characters
- Respects locale-specific conversion rules
- Numbers and special characters remain unchanged
Conclusion
Use toLocaleLowerCase() when you need locale-aware string conversion. It's particularly important for international applications where different languages have specific lowercase rules.
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