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var m = a.ToDictionary(e => e.id, e => e);final m = {
for (final e in a) e.id: e,
};Use a list literal with a for loop to produce the map elements.
m := make(map[K]V, len(a))
for _, e := range a {
m[e.id] = e
}V is the type of the elements of a.
K is the type of the field id.
K is the type of the field id.
let m = new Map(a.map(e => [e.id, e]))Map<Integer, E> m = new HashMap<>();
a.forEach(e -> m.put(e.id, e));Map<Integer, E> m = new HashMap<>();
for (E e : a) m.put(e.id, e);local m={}
for _,e in ipairs(a) do
m[e.id]=e
endtype
TList = specialize TFPGList<TData>;
TMap = specialize TFPGMap<TKey, TData>;
var
a: TList;
m: TMap;
idx: integer;
begin
....
m := TMap.Create;
for idx := 0 to a.count-1 do
begin
m.add(a.items[idx].e, a.items[idx]);
end;
....
m.Free;
....The type TData must itself define a class operator for testing the equality of TData variables.
foreach my $e (@a) {
$m{$e->id) = $e;
}m = {e.id:e for e in a}m = dict((x.id, x) for x in a)"... The dict() constructor can accept an iterator that returns a finite stream of (key, value) tuples"
m = a.group_by(&:id)