runningMin()

Calculate the running minimum value of a Stream<Comparable<T>>.

Implementation Notes

This implementation is suitable for a Stream of Comparable<T>, for a version that takes user-specified Comparator see runningMinBy(). Nulls are ignored and play no part in calculations.

Signatures

runningMin()

Additional Methods

Method	Purpose
`withOriginal()`	Emit both the original stream element and its calculated running minimum value wrapped in a `WithOriginal` object. See example.

Examples

Running minimum

Stream
    .of(3, 2, 1, 2, 3)
    .gather(Gatherers4j.runningMin())
    .toList();

// [ 3, 2, 1, 1, 1 ]

Showing nulls are ignored by default

Stream
    .of(null, 3, null, 2, 1, 2, 3)
    .gather(Gatherers4j.runningMin())
    .toList();

// [ 3, 2, 1, 1, 1 ]

Emit original value and calculated value

Note that this call may need a type witness due to generic type erasure in Java.

Stream
    .of(3, 2, 1, 2, 3)
    .gather(Gatherers4j.<Integer>runningMin().withOriginal())
    .toList();

// [
//   WithOriginal[original=3, calculated=3],
//   WithOriginal[original=2, calculated=2],
//   WithOriginal[original=1, calculated=1],
//   WithOriginal[original=2, calculated=1],
//   WithOriginal[original=3, calculated=1]
// ]