Function computeIfAbsent

If the specified key is not already associated with a value in this map, attempts to compute its value using the given mapping function and enters it into this map unless null.

  • computeIfAbsent<K, V>(map: Map<K, V>, key: K, mappingFunction: (key: K) => V): V

    Type Parameters

    • K
    • V

    Parameters

    • map: Map<K, V>

      map from which to get the key's value or compute and associate

    • key: K

      key for which to get the value or with which the computed value is to be associated

    • mappingFunction: (key: K) => V

      function to compute a value for key

    Returns V

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