JavaScript String toLocaleLowerCase() Method

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.

EN-US: geeksforgeeks
TR: geeksforgeeks
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.

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 41
• Edge 12
• Firefox 29
• Opera 28
• Safari 10