The String.prototype.toLocaleLowerCase() method in JavaScript is a Standard built-in object which returns the calling string value converted to a lowercase letter on the basis of the host’s current locale.
Syntax:
str.toLocaleLowerCase()
str.toLocaleLowerCase(locale)
Parameters:
- locale: It is an optional parameter and it indicates the locale to be used to convert to lowercase according to any locale-specific case mappings.
Returns Value:
This method returns a string of lowercase letters.
Exceptions:
This method gives two kinds of errors, which are as follows:
- RangeError: If the locale argument isn’t a valid language tag.
- TypeError: If an array element isn’t of type string.
The below examples illustrate the String.prototype.toLocaleLowerCase() method in JavaScript:
Example 1: In this example, we will convert the uppercase string to a lowercase string and console it using the String.prototype.toLocaleLowerCase() method in JavaScript.
javascript
// Input stringlet gfg = 'GeeKsForGeekS';// Output with lowercase methodconsole.log('EN-US: ' + gfg.toLocaleLowerCase('en-US'));console.log('TR: ' + gfg.toLocaleLowerCase('tr'));// New input stringlet gfg1 = new String("String.prototype.toLocaleLowerCase()");// Display outputconsole.log('Result: ' + gfg1.toLocaleLowerCase()); |
EN-US: neveropen TR: neveropen Result: string.prototype.tolocalelowercase()
Example 2: In this example, we will convert the uppercase string to a lowercase string and console it using the String.prototype.toLocaleLowerCase() method in JavaScript.
javascript
console.log('ALPHABET'.toLocaleLowerCase()); console.log('\u0130'.toLocaleLowerCase('tr') === 'i');console.log('\u0130'.toLocaleLowerCase('en-US') === 'i'); let neveropen = ['tr', 'TR', 'tr-TR', 'tr-u-co-search', 'tr-x-turkish'];console.log('\u0130'.toLocaleLowerCase(neveropen) === 'i'); |
alphabet true false true
We have a complete list of Javascript String methods, to check those please go through this JavaScript String Complete Reference article.
Supported Browsers: The browsers supported by the String.prototype.toLocaleLowerCase() method are listed below:
- Google Chrome
- Firefox
- IE
- Opera
- Safari
- Edge
