description

# SplayTreeMap<K, V>.fromIterable constructor Null safety

SplayTreeMap<K, V>.fromIterable(

1. Iterable iterable,
2. {K key(
   1. dynamic element
   ),
3. V value(
   1. dynamic element
   ),
4. int compare(
   1. K key1,
   2. K key2
   ),
5. bool isValidKey(
   1. dynamic potentialKey
   )}

)

Creates a SplayTreeMap where the keys and values are computed from the `iterable`.

For each element of the `iterable` this constructor computes a key/value pair, by applying `key` and `value` respectively.

The keys of the key/value pairs do not need to be unique. The last occurrence of a key will simply overwrite any previous value.

If no functions are specified for `key` and `value` the default is to use the iterable value itself.

## Implementation

    factory SplayTreeMap.fromIterable(Iterable iterable,
        {K Function(dynamic element)? key,
        V Function(dynamic element)? value,
        int Function(K key1, K key2)? compare,
        bool Function(dynamic potentialKey)? isValidKey}) {
      SplayTreeMap<K, V> map = SplayTreeMap<K, V>(compare, isValidKey);
      MapBase._fillMapWithMappedIterable(map, iterable, key, value);
      return map;
    }