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JavaScript - how to convert string to uppercase?

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In this quick article, we are going to discuss how to convert string to upper case in JavaScript. String class contains two methods that help to make conversion to upper case. One of them allows to make conversion with taking at acount locale. To see practical usage of methods look at below examples.

1. Built-in conversion approach example

This section shows how to convert any string to upper case taking at account locale. In almost all cases it produces similar output string to version without locale.

// ONLINE-RUNNER:browser;

var text = 'Hi! How are you?';
var convertedText = text.toUpperCase();

console.log(convertedText);

2. Built-in conversion approach with locale example

This section shows how to convert any string to upper case taking at account locale. In almost all cases it produces similar output string to version without locale.

// ONLINE-RUNNER:browser;

var text = 'Здравствуй! Как поживаете?';

var convertedText = text.toLocaleUpperCase();
//var convertedText = text.toLocaleUpperCase('ru-RU');
//var convertedText = text.toLocaleUpperCase(['ru-RU', 'en-US']);

console.log(convertedText);
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