Function count

count<T>(x, ft): number
Count values which satisfy a test.
Type Parameters
- T
Parameters
- x: T[]
  
  an array
- ft: TestFunction<T>
  
  test function (v, i, x)
Returns number
Σtᵢ | tᵢ = 1 if ft(vᵢ) else 0; vᵢ ∈ x
- Defined in index.ts:2999

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