Small question regarding Java and its Stream API, especially the reduce() operation. I have as input some Stream of integers. The integers go from -1 inclusive, to a positive integer. In the mathematical notation, it would be [-1,n]. Note that the smallest possible number is -1 (minus 1). It cannot be -2, -3, etc., the smallest is -1. I would

# Tag: reduce

## How to reduce/iterate multiple java streams of same size at once?

I have multiple Java streams of the same length, and I want to perform some operation on the corresponding elements of each stream. For e.g., add 1st elements of all stream, 2nd elements of all streams and 3rd elements of all streams and so on. How can we do this without first reducing each of the streams? for Minimum reproducible

## How to use Java reduce() function on stream of objects with BinaryOperator

combinedResult is a stream of type ObjectNode that consists of data like this for example: I want to get a result like this: I have written the below BinaryOperator function But when I try this out, I get below result: I understand that this is because I return o1 as default value in the BinaryOperator, but I don’t know how

## Iterating over and reducing values of a Java map via Stream API

Java 8 here. I have an array of Strings: Then I have a map where the keys are Strings (specifically, the same literal values as some of the animals in the array above), and the values are a count (representing the number of those animals): I am trying to figure out how to use the Stream API to iterate over