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Update documentation.md #1

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37 changes: 37 additions & 0 deletions documentation.md
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Expand Up @@ -85,6 +85,43 @@ function ProfileListScreen() {

- Sentry

### 1.7. CallBack Hell

Callback hell also known as pyramid of doom, hadouken is a way to code suboptimal

For example
```
fs.readdir(source, function (err, files) {
if (err) {
console.log('Error finding files: ' + err)
} else {
files.forEach(function (filename, fileIndex) {
console.log(filename)
gm(source + filename).size(function (err, values) {
if (err) {
console.log('Error identifying file size: ' + err)
} else {
console.log(filename + ' : ' + values)
aspect = (values.width / values.height)
widths.forEach(function (width, widthIndex) {
height = Math.round(width / aspect)
console.log('resizing ' + filename + 'to ' + height + 'x' + height)
this.resize(width, height).write(dest + 'w' + width + '_' + filename, function(err) {
if (err) console.log('Error writing file: ' + err)
})
}.bind(this))
}
})
})
}
})
```
* How do I fix callback hell?
- Keep your code shallow
- Modularize
- Handle every single error


### 2. Memoize expensive computations with React Hooks

#### 2.1. useMemo
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