# \#reduce

**URL:** https://forum.freecodecamp.org/tag/reduce/286.md

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## [Quick question about condensing arrays with reduce](https://forum.freecodecamp.org/t/quick-question-about-condensing-arrays-with-reduce/136911)

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**Author:** [@veronicarbulu](https://forum.freecodecamp.org/u/veronicarbulu)\
**Replies:** 3\
**Last updated:** [July 18, 2017, 5:48pm UTC](https://forum.freecodecamp.org/t/quick-question-about-condensing-arrays-with-reduce/136911 "2017-07-18T17:48:14Z")

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A very general question. I was able to do the assignment for this chapter, but I did have a very quick question. I've pasted the exercise so you can understand my question: 1) who has defined previousNumber and currentNu…