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Update promise.md #6

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frascu Oct 2, 2019
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frascu Oct 2, 2019
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Update promise.md
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@frascu
frascu authored Oct 2, 2019
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Expand Up @@ -4,7 +4,7 @@ La classe `Promise` è qualcosa che esiste in molti moderni motori JavaScript e

### Callback style code

In order to fully appreciate promises let's present a simple sample that proves the difficulty of creating reliable Async code with just callbacks. Consider the simple case of authoring an async version of loading JSON from a file. A synchronous version of this can be quite simple:
Al fine di apprezzare appieno le promise presentiamo un semplice esempio che dimostra la difficoltà di creare codice Async affidabile con i soli callback. Si consideri il semplice caso di creare una versione asincrona di caricamento di JSON da un file. Una versione sincrona di questo può essere abbastanza semplice:

```ts
import fs = require('fs');
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