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minor fixes

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Ilya Kantor 2020-12-06 17:36:59 +03:00
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1-js/03-code-quality/06-polyfills/article.md
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@ -24,9 +24,9 @@ Here, in this chapter, our purpose is to get the gist of how they work, and thei
A [transpiler](https://en.wikipedia.org/wiki/Source-to-source_compiler) is a special piece of software that can parse ("read and understand") modern code, and rewrite it using older syntax constructs, so that the result would be the same. A [transpiler](https://en.wikipedia.org/wiki/Source-to-source_compiler) is a special piece of software that can parse ("read and understand") modern code, and rewrite it using older syntax constructs, so that the result would be the same.
E.g. JavaScript before year 2020 didn't have the "nullish coalescing operator" `??`. So, if the visitor uses an outdated browser, it may fail to understand the code like `height = height ?? 100`. E.g. JavaScript before year 2020 didn't have the "nullish coalescing operator" `??`. So, if a visitor uses an outdated browser, it may fail to understand the code like `height = height ?? 100`.
A transpiler would analyze our code and rewrite `height ?? 100` as `(height !== undefined && height !== null) ? height : 100`. A transpiler would analyze our code and rewrite `height ?? 100` into `(height !== undefined && height !== null) ? height : 100`.
```js ```js
// before running the transpiler // before running the transpiler