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The toLocaleLowerCase()
method returns the calling string value converted to lower case, according to any locale-specific case mappings.
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
Syntax
str.toLocaleLowerCase() str.toLocaleLowerCase(locale) str.toLocaleLowerCase([locale, locale, ...])
Parameters
locale
Optional- The
locale
parameter indicates the locale to be used to convert to lower case according to any locale-specific case mappings. If multiple locales are given in anArray
, the best available locale is used. The default locale is the host environment’s current locale.
Return value
A new string representing the calling string converted to lower case, according to any locale-specific case mappings.
Exceptions
- A
RangeError
("invalid language tag: xx_yy") is thrown if alocale
argument isn't a valid language tag. - A
TypeError
("invalid element in locales argument") is thrown if an array element isn't of type string.
Description
The toLocaleLowerCase()
method returns the value of the string converted to lower case according to any locale-specific case mappings. toLocaleLowerCase()
does not affect the value of the string itself. In most cases, this will produce the same result as toLowerCase()
, 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 toLocaleLowerCase()
'ALPHABET'.toLocaleLowerCase(); // 'alphabet' '\u0130'.toLocaleLowerCase('tr') === 'i'; // true '\u0130'.toLocaleLowerCase('en-US') === 'i'; // false let locales = ['tr', 'TR', 'tr-TR', 'tr-u-co-search', 'tr-x-turkish']; '\u0130'.toLocaleLowerCase(locales) === 'i'; // true
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.toLocaleLowerCase' in that specification. |
Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'String.prototype.toLocaleLowerCase' in that specification. |
Standard | |
ECMAScript Latest Draft (ECMA-262) The definition of 'String.prototype.toLocaleLowerCase' in that specification. |
Draft | |
ECMAScript Internationalization API 4.0 (ECMA-402) The definition of 'String.prototype.toLocaleLowerCase' in that specification. |
Draft | ES Intl 2017 added the locale parameter. |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic support | Chrome Full support Yes | Edge Full support Yes | Firefox Full support 1 | IE Full support Yes | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile Full support Yes | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes | nodejs Full support Yes |
locale | Chrome ? | Edge ? | Firefox Full support 55 | IE ? | Opera ? | Safari ? | WebView Android ? | Chrome Android ? | Edge Mobile ? | Firefox Android Full support 55 | Opera Android ? | Safari iOS ? | Samsung Internet Android ? | nodejs ? |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown