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Dart's lazy initialization in action.
var potatoSack = [];
var potato = buildPotato();
String buildPotato() {
var tater = 'a delicious potato';
return tater;
void main() {
print(potatoSack); //output is [] (empty array)
print(potato); // now calls buildPotato();
print(potatoSack); // output is ['a delicious potato']
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