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add a run button

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Lavrentiy Rubtsov 2022-04-30 03:31:24 +06:00 • committed by GitHub
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1-js/05-data-types/03-string/article.md
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@ -214,7 +214,7 @@ alert( 'Interface'.toLowerCase() ); // interface
Or, if we want a single character lowercased:
```js
```js run
alert( 'Interface'[0].toLowerCase() ); // 'i'
```