Please note, this is a STATIC archive of website developer.mozilla.org from 03 Nov 2016, cach3.com does not collect or store any user information, there is no "phishing" involved.

Onze vrijwilligers hebben dit artikel nog niet naar het Nederlands vertaald. Doe mee en help de klus te klaren!

The toUpperCase() method returns the calling string value converted to upper case.

Syntax

str.toUpperCase()

Return value

A new string representing the calling string converted to upper case.

Description

The toUpperCase() method returns the value of the string converted to upper case. toUpperCase() does not affect the value of the string itself.

Examples

Using toUpperCase()

console.log('alphabet'.toUpperCase()); // 'ALPHABET'

Specifications

Specification Status Comment
ECMAScript 1st Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.0.
ECMAScript 5.1 (ECMA-262)
The definition of 'String.prototype.toUpperCase' in that specification.
Standard  
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'String.prototype.toUpperCase' in that specification.
Standard  
ECMAScript 2017 Draft (ECMA-262)
The definition of 'String.prototype.toUpperCase' in that specification.
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)

See also

Documentlabels en -medewerkers

 Aan deze pagina hebben bijgedragen: eduardoboucas, fscholz, Mingun, Sheppy, ziyunfei, evilpie, Brettz9, Mgjbot, Ptak82, Maian, Dria
 Laatst bijgewerkt door: eduardoboucas,