13B: Scala foldLeft, foldRight, scanLeft, scanRight, reduceLeft, reduceRight, etc are Monoids

This extends 13: Q81 – Q83 Scala monoids interview Q&As. Given the below code

Q01. How will you combine the two lists xs & xy? A01. The foldLeft(.)(..) to the rescue as shown below:

:+ is a…


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