Creating implementation for idiom 298 : Copy a map

Idiom

# 298 Copy a map

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Create the map y by cloning the map x.

y is a shallow copy, not a deep copy.

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var y = Map.of(x);

y := make(map[K]V, len(x))
for k, v := range x {
	y[k] = v
}

import "maps"

y := maps.Clone(x)

import java.util.Map;

Map<K, V> y = x;

fgl

type
  TMap = specialize TFPGMap<TKey, TData>;

var
  x, y: TMap;

begin
  x:= TMap.Create;
  ... 
  y:= TMap.Create;
  Map1.AddList(x);
end.

my %y = %x;

y = x.copy()

y = x.dup