w3resource

JavaScript toUpperCase() Method : String Object

Description

The toUpperCase() method is used to convert a string to uppercase.

Version

Implemented in JavaScript 1.0

Syntax

toUpperCase()

Parameter

None

Example:

In the following web document toUpperCase() method converts a given string to uppercase.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>JavaScript String object - toUpperCase() method example</title>
</head>
<body>
<h1 style="color: red">JavaScript String object : toUpperCase() method</h1>
<hr />
<script type="text/javascript">
//This is done to make the following JavaScript code compatible to XHTML. <![CDATA[
var lwtxt="alphabet"
document.write(lwtxt.toUpperCase())
//]]>
</script>
</body>
</html>

View the example in the browser

Supported Browser

Internet Explorer 7 Firefox 3.6 Google Chrome 7 Safari 5.0.1 Opera 10
Yes Yes Yes Yes Yes

See also:

JavaScript Core objects, methods, properties.

Previous: JavaScript toString() Method: String Object
Next: JavaScript valueOf() Method: String Object

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JavaScript: Tips of the Day

Import keyword

// index.js
console.log('running index.js');
import { sum } from './sum.js';
console.log(sum(1, 2));

// sum.js
console.log('running sum.js');
export const sum = (a, b) => a + b;

With the import keyword, all imported modules are pre-parsed. This means that the imported modules get run first, the code in the file which imports the module gets executed after.
This is a difference between require() in CommonJS and import! With require(), you can load dependencies on demand while the code is being run. If we would have used require instead of import, running index.js, running sum.js, 3 would have been logged to the console.

Ref: https://bit.ly/323Y0P6

 

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