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Jean-Philippe Sirois
2020-07-24 11:03:09 -04:00
parent 118473e20a
commit 8434c706d5
16 changed files with 130 additions and 117 deletions
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src/content/resources/language/javascript/promises/converting-a-callback.md
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@@ -66,18 +66,18 @@ const weather = await getWeatherAsync("Los Angeles").catch((error) => {
console.log(weather);
```
In Node.js >v8.0.0 you can make use of the built-in `util` package which exposes a
In Node.js >v8.0.0 you can make use of the built-in `util` package which exposes a
[promisify](https://nodejs.org/api/util.html#util_util_promisify_original) method. This method helps us convert our original function to a promise-based function so that it returns the callback.
Using our example from earlier, we can write it as:
```js
const util = require("util")
const util = require("util");
const getWeatherAsync = util.promisify(getWeather)
const getWeatherAsync = util.promisify(getWeather);
const weather = await getWeatherAync("Los Angeles").catch(console.log)
console.log(weather)
const weather = await getWeatherAync("Los Angeles").catch(console.log);
console.log(weather);
```
**Note:** the `promisify` method adds a extra argument to the arguments you passed in. In this case we are calling the custom function with a single parameter of type `String`, which means the original function should also accept `(String, Function)`, `Function` being the callback `(error, result)`.