DoubleStream mapToLong() in Java
DoubleStream mapToLong() returns a LongStream consisting of the results of applying the given function to the elements of this stream.
Note : DoubleStream mapToLong() is a intermediate operation. These operations are always lazy. Intermediate operations are invoked on a Stream instance and after they finish their processing, they give a Stream instance as output.
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LongStream mapToLong(DoubleToLongFunction mapper)
- DoubleStream : A sequence of primitive double-valued elements. This is the double primitive specialization of Stream.
- mapper : A stateless function to apply to each element.
Return Value : The function returns a LongStream consisting of the results of applying the given function to the elements of this stream.
Example 1 :
3 6 16 8 10
Example 2 :
-7 -4 6 -2 0
Example 3 :
21 84 537 151 216