lam

1. Lambda Function
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2. Imperative data processing to
Streams
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menu.parallelStream()
.filter(d -> d.getCalories() > 300)
.map(Dish::getName)
.collect(toList());

3. lambda expressions to method
references
Map<CaloricLevel, List<Dish>>
dishesByCaloricLevel = menu. stream()
.collect( groupingBy(dish -> {
if (dish.getCalories() <= 400)
return CaloricLevel.DIET;
else if (dish.getCalories() <= 700)
return CaloricLevel.NORMAL;
else
return CaloricLevel.FAT; }));
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4. Map<CaloricLevel, List<Dish>>
dishesByCaloricLevel = menu.stream()
.collect(groupingBy(Dish::getCaloricLevel));
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