count ()

count<T>(p): (<U>(x) => U extends Opt<T>
? 0 | 1
: number)
Same as Opt.count, but also supports arrays.
Type Parameters
- T
Parameters
- p: ((_) => boolean)
  - - (_): boolean
    - Parameters
      _: T
      Returns boolean
Returns (<U>(x) => U extends Opt<T>
? 0 | 1
: number)
- - <U>(x): U extends Opt<T>
    ? 0 | 1
    : number
  - Type Parameters
    - U extends Opt<T> | readonly T[]
    Parameters
    - x: U
    Returns U extends Opt<T>
    ? 0 | 1
    : number
Example
```
const greaterThanZero = (x: number) => x > 0;

count(greaterThanZero)([-3, 0, 5, 10]) // 2
```
See
Opt.count
- Defined in Opt.ts:2643