The toUpperCase() method returns the string converted to uppercase.
Example
const message = "javascript is fun";
// convert message to uppercase
const upperMessage = message.toUpperCase();
console.log(upperMessage);
// Output: JAVASCRIPT IS FUN
toUpperCase() Syntax
The syntax of the toUpperCase() method is:
str.toUpperCase()
Here, str is a string.
toUpperCase() Parameters
The toUpperCase() method does not take in any parameters.
toUpperCase() Return Value
- Returns a new string representing the calling string converted to uppercase.
Notes:
- The
toUpperCase()method raisesTypeErrorwhen called onnullorundefined. - The
toUpperCase()method does not change the original string.
Example: Using toUpperCase() method
let str = "Hello World!";
let sentence = "Java is to JavaScript what Car is to Carpet.";
let uppercase_str = str.toUpperCase();
console.log(uppercase_str); // HELLO WORLD!
let uppercase = sentence.toUpperCase();
console.log(uppercase); // JAVA IS TO JAVASCRIPT WHAT CAR IS TO CARPET.
Output
HELLO WORLD! JAVA IS TO JAVASCRIPT WHAT CAR IS TO CARPET.
Recommended Reading: JavaScript String toLowerCase()