The benefits are
- efficient (memory & speed)
- clear intent
- concise
There are always use cases where you want to mutate arrays.
How would you rewrite the following `deselect` method using `filter`?
``` js
export class Selector<T> {
private _values: T[] = [];
get values(): ReadonlyArray<T> {
return this._values;
}
/**
* Removes [value] from the list of selected items.
*
* Returns `true` if [value] was previously selected, `false` otherwise.
*/
deselect(value: T): boolean {
if (this._values.remove(value)) {
this.selectionChanged([], [value]);
return true;
}
return false;
}
/**
* Adds [value] to the list of selected items.
*
* Returns `true` if [value] was not previously selected, `false` otherwise.
*/
select(value: T): boolean {
if (this._values.pushIfAbsent(value)) {
this.selectionChanged([value], []);
return true;
}
return false;
}
protected selectionChanged(addedValues, removedValues) {
// Do something such as firing an event.
}
}
```
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