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Transducing for fun
and profit
simon@metabase.com

@sbelak
Clojure at a glance
• (lisp (running-on :JVM))
• Functional, dynamic, immutable

• Excellent concurrency and state-management primitives

• Unparalleled data manipulation
Anatomy of a transducer
• Transducers decomplect recursion mechanism, transformation,
building the output, and access mechanism











• 3 user-facing “protocols”: transducer, reducing fn, CollReduce
transducer and reducing
function
Using a transducer to
wrap/keep state
transducer and reducing
function
Wrap Java
CollReduce protocol
• Get the next element

• Makes transducing data structure-agnostic allowing us to
(re)use transducers for things such as clojure.async
channels
Transducing an async
channel
Composing transducers
1. comp transducers



2. Reducing function and transducer

3. github.com/henrygarner/redux

post-complete fuse











Data structure that can be
manipulated like any other
On-line/streaming
analysis
Metabase ❤

github.com/metabase/metabase
• Open source analytics tool (runs on-premises)

• Building a “data scientist in a box”

• Hundreds to billions of rows

• Some DBs optimised for analytics, some not
Many batch algorithms can
be turned into online ones
Parallelize independent computations Find a recursive relation
github.com/MastodonC/kixi.stats
• Count

• (Arithmetic) mean

• Geometric mean

• Harmonic mean

• Median

• Variance

• Interquartile range

• Standard deviation

• Standard error

• Skewness
• Kurtosis

• Covariance

• Covariance matrix

• Correlation

• Correlation matrix

• Simple linear regression

• Standard error of the mean

• Standard error of the estimate

• Standard error of the prediction

• …
Single-pass analysis
Data = code
Using transducers is
worth it for the
composition alone
Annoyances
• Can only transduce one coll at a time

• Always have to pass in an xf (especially annoying when
using redux)

• Having functions that return a transducer or not is error
prone

• Inconsistent support for transducers in core library
Questions
simon@metabase.com

@sbelak

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