Function filter

filter<T>(object, fn): IterableIterator<T>
Filter an iterable for values which pass a test.
Type Parameters
- T
Parameters
- object: Iterable<T>
  The iterable object of interest.
- fn: ((value, index) => boolean)
  The predicate function to invoke for each value.
  - - (value, index): boolean
    - Parameters
      value: T
      index: number
      Returns boolean
Returns IterableIterator<T>
An iterator which yields the values which pass the test.

Example
```
import { filter } from '@lumino/algorithm';

let data = [1, 2, 3, 4, 5, 6];

let stream = filter(data, value => value % 2 === 0);

Array.from(stream);  // [2, 4, 6]
```
- Defined in filter.ts:31