SortedMap<K extends Comparable, V>.fromIterable constructor
SortedMap<K extends Comparable, V>.fromIterable (})
Creates a SortedMap 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 SortedMap.fromIterable(Iterable iterable,
{K Function(dynamic)? key,
V Function(dynamic)? value,
Ordering ordering = const Ordering.byKey()}) {
var map = SortedMap<K, V>(ordering);
key ??= (v) => v;
value ??= (v) => v;
for (var element in iterable) {
map[key(element)] = value(element);
}
return map;
}