continuations
... • Lisp introduced (in the 70’s) catch and throw to give a non-local return capability • It was a very useful generalization of return • (throw) causes a return from the
nearest matching (catch ) found on stack
(defun foo-outer () (catch (foo-inner)))
(defun foo-inner () … (if x (throw t)) ...
... • Lisp introduced (in the 70’s) catch and throw to give a non-local return capability • It was a very useful generalization of return • (throw
PPT
... Functional languages • In a pure functional language, every program is just an expression evaluation let add1 x = x + 1 let rec add (x,y) = if x=0 then y else add(x-1, add1(y)) add(2,3) = add(1,add1(3)) = add(0,add1(add1(3))) = add1(add1(3)) = add1(3+1) = 3+1+1 ...
... Functional languages • In a pure functional language, every program is just an expression evaluation let add1 x = x + 1 let rec add (x,y) = if x=0 then y else add(x-1, add1(y)) add(2,3) = add(1,add1(3)) = add(0,add1(add1(3))) = add1(add1(3)) = add1(3+1) = 3+1+1 ...
threads
... Synchronous I/O + intuitive Finite state machines / control flow primitives Continuation-passing style (CPS) programming ...
... Synchronous I/O + intuitive Finite state machines / control flow primitives Continuation-passing style (CPS) programming ...
JSJS - Project Proposal
... Immutable data structures make programs more robust and easy to reason about. Data structures in JavaScript are completely mutable. JSJS will provide immutable implementations for Lists and Maps in the language, with a standard library for functions like List.hd and List.tl, and Map.get and Map.set. ...
... Immutable data structures make programs more robust and easy to reason about. Data structures in JavaScript are completely mutable. JSJS will provide immutable implementations for Lists and Maps in the language, with a standard library for functions like List.hd and List.tl, and Map.get and Map.set. ...
Introduction to JavaScript
... Some JavaScript Syntax Rules • JavaScript is case sensitive • JavaScript ignores most occurrences of extra white space • In general, do not break a statement into several lines • The + symbol used in a command combines several text strings into a single text string, e.g. “Rick “ + “Bournique” is th ...
... Some JavaScript Syntax Rules • JavaScript is case sensitive • JavaScript ignores most occurrences of extra white space • In general, do not break a statement into several lines • The + symbol used in a command combines several text strings into a single text string, e.g. “Rick “ + “Bournique” is th ...
3_types
... // note how several values can be output by a single statement // a statement that introduces a variable is called a declaration // a variable holds a value of a specified type // the final return 0; is optional in main() // but you may need to include it to pacify your compiler Stroustrup/Programmi ...
... // note how several values can be output by a single statement // a statement that introduces a variable is called a declaration // a variable holds a value of a specified type // the final return 0; is optional in main() // but you may need to include it to pacify your compiler Stroustrup/Programmi ...
Functional Programming, Parametricity, Types
... theorems about this function can be reliably constructed ...
... theorems about this function can be reliably constructed ...
ppt
... – Typed constructs are naturally composed in an orthogonal way, thus type systems promote orthogonal programming language design and eliminate artificial ...
... – Typed constructs are naturally composed in an orthogonal way, thus type systems promote orthogonal programming language design and eliminate artificial ...
ppt
... • However, type system design and type checking and/or inferencing algorithms is one of the hottest topics in programming language research at present! ...
... • However, type system design and type checking and/or inferencing algorithms is one of the hottest topics in programming language research at present! ...
Testing an Optimising Compiler by Generating Random Lambda
... The formal language that we choose to develop our ideas is essentially the simply-typed λ-calculus [13] extended with constants and basic types. The calculus allows programs to define and manipulate variables and functions. Specifically, programs are constructed from four different kinds of terms: v ...
... The formal language that we choose to develop our ideas is essentially the simply-typed λ-calculus [13] extended with constants and basic types. The calculus allows programs to define and manipulate variables and functions. Specifically, programs are constructed from four different kinds of terms: v ...
Programming in the pure lambda
... calculus by showing that there are λexpressions that can be used to emulate some basic features of Haskell, namely definitions, booleans, pairs, lists, numbers and recursion. ...
... calculus by showing that there are λexpressions that can be used to emulate some basic features of Haskell, namely definitions, booleans, pairs, lists, numbers and recursion. ...
Decorators in Python
... before and after a function is called. A decorator takes a function object as an argument (which is called the decoratee) and returns a new function object that will be executed in its place. The function object constructed inside the decorator usually calls the decoratee. A decorator is executed ...
... before and after a function is called. A decorator takes a function object as an argument (which is called the decoratee) and returns a new function object that will be executed in its place. The function object constructed inside the decorator usually calls the decoratee. A decorator is executed ...
Introduction, Functions
... Why learn Haskell? • Important to learn many languages over your career • Functional languages increasingly important in industry • Puts experienced and inexperienced programmers on an equal footing • Operate on data structure as a whole rather than piecemeal • Good for concurrency, which is increa ...
... Why learn Haskell? • Important to learn many languages over your career • Functional languages increasingly important in industry • Puts experienced and inexperienced programmers on an equal footing • Operate on data structure as a whole rather than piecemeal • Good for concurrency, which is increa ...
Slide
... I/O in Haskell • Problematic point, because Haskell intends to preserve referential transparency. – An expression is said to be referentially transparent if it can be replaced with its value without changing the program. – Referential transparency requires the same results for a given set of argume ...
... I/O in Haskell • Problematic point, because Haskell intends to preserve referential transparency. – An expression is said to be referentially transparent if it can be replaced with its value without changing the program. – Referential transparency requires the same results for a given set of argume ...
Functional Programming
... I/O in Haskell • Problematic point, because Haskell intends to preserve referential transparency. – An expression is said to be referentially transparent if it can be replaced with its value without changing the program. – Referential transparency requires the same results for a given set of argume ...
... I/O in Haskell • Problematic point, because Haskell intends to preserve referential transparency. – An expression is said to be referentially transparent if it can be replaced with its value without changing the program. – Referential transparency requires the same results for a given set of argume ...
COS_470-Practice
... insert-sort that will recursively sort a list of numbers nums (defun insert-sort (nums) ;; define here the base case to stop the recursion: ;; if nums is empty, return an empty list ;; otherwise call insert1 appropriately ...
... insert-sort that will recursively sort a list of numbers nums (defun insert-sort (nums) ;; define here the base case to stop the recursion: ;; if nums is empty, return an empty list ;; otherwise call insert1 appropriately ...
Introduction to Programming in Python
... - input: a comma separated list of values - returns: the minimum or maximum value in the list • Click here to see a complete list of Python built-in functions. We will continue to work with some of them in later modules. ...
... - input: a comma separated list of values - returns: the minimum or maximum value in the list • Click here to see a complete list of Python built-in functions. We will continue to work with some of them in later modules. ...
Mathematically Structured but not Necessarily Functional
... code extracted from constructive proofs. This allows us to realize statements which are not provable in intuitionistic logic. Even when a purely functional realizer could be extracted from a proof, we might prefer an impure handwritten one because it is more efficient, or because it is easier to wri ...
... code extracted from constructive proofs. This allows us to realize statements which are not provable in intuitionistic logic. Even when a purely functional realizer could be extracted from a proof, we might prefer an impure handwritten one because it is more efficient, or because it is easier to wri ...
Overview of Leda Programming Language
... The overall program structure of a Leda program is a series of zero or more declarations followed by a single compound statement making up the body of the program. Comments are supported within the program text by use of the curly brackets. The include special statement in Leda allows the attachment ...
... The overall program structure of a Leda program is a series of zero or more declarations followed by a single compound statement making up the body of the program. Comments are supported within the program text by use of the curly brackets. The include special statement in Leda allows the attachment ...
Sexy types in action - Indiana University Computer Science
... 3.3 Programs from algebraic specifications Programs written in a functional style are often derived from specifications of abstract data types. A specification explains how values are constructed, mutated, and observed. Because (purely) functional programming languages support equational reasoning, ...
... 3.3 Programs from algebraic specifications Programs written in a functional style are often derived from specifications of abstract data types. A specification explains how values are constructed, mutated, and observed. Because (purely) functional programming languages support equational reasoning, ...