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Yallop's thesis

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thesis.bib
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@@ -3484,3 +3484,11 @@
school = {University of Ljubljana, Slovenia}, school = {University of Ljubljana, Slovenia},
year = {2020} year = {2020}
} }
# Jeremy Yallop's phd thesis
@phdthesis{Yallop10,
author = {Jeremy Yallop},
title = {Abstraction for web programming},
school = {The University of Edinburgh, {UK}},
year = {2010}
}

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thesis.tex
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@@ -1330,9 +1330,25 @@ effect handlers.
\dhil{The problem with monads is that they do not \dhil{The problem with monads is that they do not
compose. Cite~\citet{Espinosa95}, \citet{VazouL16} \citet{McBrideP08}} compose. Cite~\citet{Espinosa95}, \citet{VazouL16} \citet{McBrideP08}}
% %
Another problem is that monads break the basic doctrine of modular The inherent problems with monads is that they break the basic
abstraction, which we should program against an abstract interface, doctrine of modular abstraction, which says we should program against
not an implementation. A monad is a concrete implementation. an abstract interface, not an implementation. A monad is a concrete
implementation. Monadic effect operations are intimately tied to the
concrete monad structure.
It is worth mentioning \citeauthor{McBrideP08}'s idioms (known as
applicative functors in Haskell) as an alternative to monadic
programming~\cite{McBrideP08}. Idioms provide an applicative style for
programming with effects. Even though idioms are computationally
weaker than monads, they are still capable of simulating a wide range
of computational effects whose realisation do not require the full
monad structure (consult \citet{Yallop10} for a technical analysis of
idioms and monads).
We will wrap up this crash course in effectful programming by looking
at two techniques for programming in direct-style with effects that
make use of delimited control before finishing with a brief discussion
of effect tracking.
\subsubsection{Monadic reflection on state} \subsubsection{Monadic reflection on state}
% %
@@ -1586,16 +1602,16 @@ A benefit of using monads for effectful programming is that we get
effect tracking `for free' (some might object to this statement and effect tracking `for free' (some might object to this statement and
claim we paid for it by having to program in monadic style). Effect claim we paid for it by having to program in monadic style). Effect
tracking is a useful tool for making programming with effects less tracking is a useful tool for making programming with effects less
prone to error in much the same way a static type system is useful prone to error in much the same way a static type system is useful for
detecting a wide range of potential runtime errors at compile detecting a wide range of potential runtime errors at compile time.
time.
The principal idea of an effect system is to annotate computation The principal idea of an effect system is to annotate computation
types with the collection of effects that their inhabitants are types with the collection of effects that their inhabitants are
allowed to perform, e.g. the type $A \to B \eff E$ denotes a function allowed to perform, e.g. the type $A \to B \eff E$ is inhabited by
that accepts a value of type $A$ as input and ultimately returns a functions that accept a value of type $A$ as input and ultimately
value of type $B$. As it computes the $B$ value it is allowed to use return a value of type $B$. As an inhabitant computes the $B$ value it
the operations given by the effect signature $E$. is allowed to perform the effect operations mentioned by the effect
signature $E$.
This typing discipline fits nicely with the effect handlers-style of This typing discipline fits nicely with the effect handlers-style of
programming. The $\Do$ construct provides a mechanism for injecting an programming. The $\Do$ construct provides a mechanism for injecting an