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Fix possible typos in 1.3.6 (Polyfills and transpilers) #2356

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Dec 6, 2020
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Fix possible typos in 1.3.6 (Polyfills and transpilers) #2356

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6 changes: 3 additions & 3 deletions 1-js/03-code-quality/06-polyfills/article.md
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Expand Up @@ -24,16 +24,16 @@ 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.

E.g. JavaScript before year 2020 didn't have the "nullish coalescing operator" `??`. So, if the visitor uses an outdated browser, it may fail understand the code like `height = height ?? 100`.
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`.

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` as `(height !== undefined && height !== null) ? height : 100`.

```js
// before running the transpiler
height = height ?? 100;

// after running the transpiler
height = (height !== undefined && height != null) ? height : 100;
height = (height !== undefined && height !== null) ? height : 100;
```

Now the rewritten code is suitable for older JavaScript engines.
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