JavaScript String toLocaleUpperCase() Method
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JavaScript String toLocaleUpperCase() Method
The toLocaleUpperCase() method returns the calling string value converted to upper case, according to any locale-specific case mappings.
Note: This method does not alter the original string.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var str = "i̇a Gesäß";
// 'lt-LT' = Lithuania
var locale = 'lt-LT';
var result = str.toLocaleUpperCase(locale);
document.write(result);
</script>
</body>
</html>
Syntax
str.toLocaleUpperCase(locale)
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| locale | optional | The locale parameter indicates the locale to be used to convert to upper case according to any locale-specific case mappings. If omitted, the default locale is the host environment’s current locale. |
Return Value
| Value | Explanation |
|---|---|
| String | Returns a new string representing the calling string converted to upper case, according to any locale-specific case mappings. |
toLocaleUpperCase() vs toUpperCase()
In the following example, we will check whether toLocaleUpperCase() and toUpperCase() string methods return the same result.
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var str = "i̇a Gesäß";
// 'lt-LT' = Lithuania
var locale = 'lt-LT';
var result1 = str.toLocaleUpperCase(locale);
var result2 = str.toUpperCase();
document.write(result1 == result2);
</script>
</body>
</html>
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