Function count

  • Count values which satisfy a test.

    Returns

    Σtᵢ | tᵢ = 1 if ft(vᵢ) else 0; [kᵢ, vᵢ] ∈ x

    Parameters

    • x: object

      an object

    • ft: TestFunction

      test function (v, k, x)

    Returns number

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