Function head

  • Get first entry from map (default order).

    Type Parameters

    • K

    • V

    Parameters

    • x: Entries<K, V>

      a map

    • ed: [K, V] = ...

      default entry

    Returns [K, V]

    [k₀, v₀] if x ≠ Φ else ed | [k₀, v₀] ∈ x

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