Function exactly

exactly<TElement>(
    source: Iterable<TElement>,
    count: number,
    predicate?: Predicate<TElement>,
): boolean
Determines whether source contains exactly count elements that satisfy the optional predicate.
Type Parameters
- TElement
  Type of elements within the source iterable.
Parameters
- source: Iterable<TElement>
  The iterable whose elements are evaluated.
- count: number
  Exact number of matching elements required. Must be greater than or equal to 0.
- Optionalpredicate: Predicate<TElement>
  Optional predicate that determines which elements are counted. When omitted, every element is considered a match.
Returns boolean
true when exactly count matching elements are present; otherwise, false.
Throws
Thrown when count is negative.

Throws
Re-throws any error encountered while iterating source or executing the predicate.

Remarks
Enumeration stops once the running total exceeds count, preventing unnecessary work on long iterables.
Example
```
const numbers = [1, 2, 3, 4, 5];
const hasExactlyThreeOdds = exactly(numbers, 3, n => n % 2 !== 0);
console.log(hasExactlyThreeOdds); // true
```
- Defined in src/enumerator/functions/exactly.ts:21