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The toLocaleUpperCase() method returns the calling string value converted to upper case, according to any locale-specific case mappings.
Syntax
str.toLocaleUpperCase()Return value
A new string representing the calling string converted to upper case, according to any locale-specific case mappings.
Description
The toLocaleUpperCase() method returns the value of the string converted to upper case according to any locale-specific case mappings. toLocaleUpperCase() does not affect the value of the string itself. In most cases, this will produce the same result as toUpperCase(), but for some locales, such as Turkish, whose case mappings do not follow the default case mappings in Unicode, there may be a different result.
Examples
Using toLocaleUpperCase()
console.log('alphabet'.toLocaleUpperCase()); // 'ALPHABET'
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 3rd Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.2. |
| ECMAScript 5.1 (ECMA-262) The definition of 'String.prototype.toLocaleUpperCase' in that specification. |
Standard | |
| ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'String.prototype.toLocaleUpperCase' in that specification. |
Standard | |
| ECMAScript 2017 Draft (ECMA-262) The definition of 'String.prototype.toLocaleUpperCase' in that specification. |
Draft |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |