Function count

count<E>(array?, predicate?): number
Returns the count of elements in the given array which match the given filter
Type Parameters
- E
Parameters
- Optionalarray: null | E[] | readonly E[]
  the array to inspect
- Optionalpredicate: ((value: E, index: number) => boolean)
  the function to filter the given array
  - - (value, index): boolean
    - Parameters
      value: E
      index: number
      Returns boolean
Returns number
the count of elements in the given array which match the given filter
Example
```
count(['foo', 'bar', 'foobar'], value => value.includes('foo'));    // 2
```