Function query

query<TElement, TResult>(
matrix: Matrix<TElement>,
selector: Function<TElement, TResult>,
): Matrix<TResult>
Queries data from a Matrix using a selector Function to transform the objects in each cell of data in the Matrix into a result.
Type Parameters
- TElement
- TResult
  The type of value returned by the selector.
Parameters
- matrix: Matrix<TElement>
  The Matrix to query data from.
- selector: Function<TElement, TResult>
  A callback Function to create a result from each cell of the Cube.
Returns Matrix<TResult>
Remarks
The Matrix may also be a Cube or Hypercube.
Example
The following code queries a Cube, returning the average age of players in a squad by country by position:
```
const x = dimension(positions, property<Player>('position')); // using the built-in dimension generator matching a property
const y = dimension(countries, (country: string) => (player: Player) => player.country === country); // using a user-defined generator

const cube: Cube<Player> = pivot(squad, y, x);

const result: Matrix<number> = query(cube, average(age()));

function age(asAt: Date = new Date()): Function<Player, number> {
  return player => new Date(asAt.getTime() - player.dateOfBirth.getTime()).getUTCFullYear() - 1970;
}
```
See GitHub for a complete example.
- Defined in index.ts:149