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Fix typo

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build-in --> built-in
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Violet.Lee 2019-06-16 00:15:51 +09:00 • committed by GitHub
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1-js/06-advanced-functions/05-global-object/article.md
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@ -58,7 +58,7 @@ That said, using global variables is generally discouraged. There should be as f
We can test the global object for support of modern language features. We can test the global object for support of modern language features.
For instance, test if a build-in `Promise` object exists (it doesn't in really old browsers): For instance, test if a built-in `Promise` object exists (it doesn't in really old browsers):
```js run ```js run
if (!window.Promise) { if (!window.Promise) {
alert("Your browser is really old!"); alert("Your browser is really old!");