imeian at gmail.com (2019-09-06T08:30:34.188Z)
When we need to change a value using the old value :
```js
variable = itself + 5 // instead of
variable = variable + 5
```
```js
object.child.property = itself / 5 // instead of
object.child.property = object.child.property / 5
```
Changing a value in nested objects is a pain, like Redux states for eg.
```js
return {
...state,
child: {
...state.child,
subchild: {
...state.child.subchild,
property: state.child.subchild.property + 1
}
}
}
```
would then be
```js
return {
...state,
child: {
...itself,
subchild: {
...itself,
property: itself + 1
}
}
}
```
When we need to change a value using the old value : variable = itself + 5 // instead of variable = variable + 5 object.child.property = itself / 5 // instead of object.child.property = object.child.property / 5 Changing a value in nested objects is a pain, like Redux states for eg. return { ...state, child: { ...state.child, subchild: { ...state.child.subchild, property: state.child.subchild.property + 1 } } } would then be return { ...state, child: { ...itself, subchild: { ...itself, property: itself + 1 } } } -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20190906/215b72a0/attachment.html>