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On a quick page-down through the code, I think this is not related to AWS-Lambda, it's more 'local lambda' where the map etc is run locally.

First, a list of keys is generated based on the set context (and modifier functions). "context" returns a Request object, allowing you to call a lambda function (each, forEach, map, reduce, filter). Each lambda function returns a Promise, allowing you to chain them together. They will operate over the same context, in sequence.

Edit: This is not related to aws lambda...sorry for the confusion

I thought this too. You could easily ship/eval the toString()'s of the functions in individual Lambda functions, the name is definitely confusing haha.