string.toLocaleUpperCase

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

See also

• String.prototype.toLocaleLowerCase()
• String.prototype.toLowerCase()
• String.prototype.toUpperCase()