Function mappedArray

mappedArray<T>(length: number, filler: (index: number) => T): T[]
Creates a new function with a given length, filling the array with elements from a given function taking indices to array elements.
Type Parameters
- T
Parameters
- length: number
  length of the new Array
- filler: (index: number) => T
  function taking indices to array elements
Returns T[]
an array filled with the mapped values
Example: Simple Example
```
mappedArray(5, (n) => n * n);
// returns
[0, 1, 4, 9, 16]
```
Example: Comparison to `fill().map()`
```
// Instead of
new Array(5).fill(null).map((_, i) => ...);
// do
mappedArray(5, (i) => ...);
```
Example: Comparison with `Array.prototype.fill`
```
mappedArray(5, () => "value");
// effectively equivalent to
new Array(5).fill("value");
```