String.prototype.toLocaleLowerCase()

The toLocaleLowerCase() method returns the calling string value converted to lower case, according to any locale-specific case mappings.

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 an Array, 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 a locale 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
ECMAScript Latest Draft (ECMA-262)
The definition of 'String.prototype.toLocaleLowerCase' in that specification.
ECMAScript Internationalization API 4.0 (ECMA-402)
The definition of 'String.prototype.toLocaleLowerCase' in that specification.

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
toLocaleLowerCaseChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 5.5Opera Full support YesSafari Full support 1.3WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support YesSafari iOS Full support 1Samsung Internet Android Full support 1.0nodejs Full support Yes
localeChrome Full support 58Edge Full support 12Firefox Full support 55IE Full support 6Opera Full support 45Safari Full support 10WebView Android Full support 58Chrome Android Full support 58Firefox Android Full support 55Opera Android Full support 43Safari iOS Full support 10Samsung Internet Android Full support 7.0nodejs ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

See also

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