JavaScript String toLowerCase() Method

The JavaScript toLowerCase() method Converts all characters of a string to lowercase and returns a new string without changing the original.

• Used for case-insensitive comparisons
• Helps standardize user input
• Common in text formatting and data validation
• Does not modify the original string

Syntax:

str.toLowerCase();

Return value:

The toLowerCase() method returns a modified version of the original string. It converts all uppercase letters into lowercase.

• Returns a new string.
• All uppercase letters are converted to lowercase.
• The original string is not changed.

[Example 1]: Converting all characters of a string to lowercase

The toLowerCase() method converts all characters in the string 'GEEKSFORGEEKS' to lowercase. The resulting string 'geeksforgeeks' is then logged to the console.

[Example 2]:Converting elements of array to lowercase

The code uses map() to convert each array element to lowercase with toLowerCase(), producing ['javascript', 'html', 'css'] and logging it to the console.