Welcome back, Sujit Kumar Mishra

Stream API Mapping

- In the Stream API, what is the difference between map() and mapToObj()?

- When should each be used?

Stream API Mapping: map() vs mapToObj()

1: map() is used to transform each element in a stream to another value. For example, you can convert a list of numbers to their squares.

2: mapToObj() is used when you are working with primitive streams (like IntStream, DoubleStream) and want to convert them to an object stream (Stream of objects).

When to use:

1: Use map() for regular streams (Stream) when you want to change the value but keep it as an object.

2: Use mapToObj() for primitive streams (like IntStream) when you want to turn primitives into objects.

Easy way to remember:

map() = change objects to other objects.

mapToObj() = change primitives to objects.

Example:

Stream<String>.map(String::length) → Stream

IntStream.mapToObj(i -> "Number: " + i) → Stream

Summary:

Use map() for object streams, mapToObj() for primitive streams to convert to objects.