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JavaScript String toLowerCase() Method
The JavaScript String toLowerCase() method converts all the characters in a string to lowercase letters. It does not change the original string, but returns a new string.
Syntax
Following is the syntax of JavaScript String toLowerCase() method −
toLowerCase()
Parameters
- It does not accept any parameters.
Return value
This method returns a string with all characters in lowercase.
Example 1
The following example demonstrates the to usage this method. It converts the characters of the string "TUTORIALSPOINT" into lowercase letters.
<html> <head> <title>JavaScript String toLowerCase() Method</title> </head> <body> <script> const original_str = "TUTORIALSPOINT"; document.write("Original string is: ", original_str); const lowercase_str = original_str.toLowerCase(); document.write("<br>New string(after converting into lowercase) is: ", lowercase_str); </script> </body> </html>
Output
The above program returns "tutorialspoint" in the output −
Original string is: TUTORIALSPOINT New string(after converting into lowercase) is: tutorialspoint
Example 2
Let's compare two strings after converting one of them "HELLOWORLD" to lowercase letters and display a statement based on the criteria satisfied.
<html> <head> <title>JavaScript String toLowerCase() Method</title> </head> <body> <script> const str1 = "helloworld"; const str2 = "HELLOWORLD"; document.write("str1 = ", str1); document.write("<br>str2 = ", str2); document.write("<br>Before conversion:<br>"); if(str1 === str2){ document.write("String str1 and str2 are equal"); } else{ document.write("String str1 and str2 are not equal"); } document.write("<br>After conversion:<br>"); if(str1 === str2.toLowerCase()){ document.write("String str1 and str2 are equal"); } else{ document.write("String str1 and str2 are not equal"); } </script> </body> </html>
Output
After executing the above program, it displays the following statements as −
str1 = helloworld str2 = HELLOWORLD Before conversion: String str1 and str2 are not equal After conversion: String str1 and str2 are equal
Example 3
Let's use the charAt() and toLowerCase() methods to convert a specific character in a string to lowercase. In this example, we retrieve a specific character in the string using the charAt() method and try to convert it to lowercase using the toLowerCase() method.
<html> <head> <title>JavaScript String toLowerCase() Method</title> </head> <body> <script> const str = "TutorialsPoint"; document.write("String str = ", str); document.write("<br>After converting a specific character '", str.charAt(9), "' into in lowercase: "); document.write(str.charAt(9).toLowerCase()); </script> </body> </html>
Output
The above program converts a specific character 'P' to a lowercase.
String str = TutorialsPoint After converting a specific character 'P' into in lowercase: p