Summary
The toUpperCase() method returns the calling string value converted to uppercase.
Syntax
str.toUpperCase()Description
The toUpperCase method returns the value of the string converted to uppercase. toUpperCase does not affect the value of the string itself.
Examples
Example: Using toUpperCase
console.log( "alphabet".toUpperCase() ); // "ALPHABET"
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 1st Edition. | Standard | Initial definition. Implemented in JavaScript 1.0 |
| ECMAScript Language Specification 5.1th Edition (ECMA-262) | Standard | |
| ECMAScript Language Specification 6th Edition (ECMA-262) | Draft |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |