Tim Hunter Ling185A, Winter 2021, UCLA Guidelines and ideas for final mini-projects You have a fair amount of freedom in choosing what to do for a final mini-project. It should not be particularly huge: something roughly the “size” of two weekly homework assignment is not a bad guide to keep in mind. The standard expectations […]
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cse130 https://ucsd-cse130.github.io/wi21/lectures/01-lambda.html Lambda Calculus Your Favorite Language Probably has lots of features: Assignment (x = x + 1) Booleans, integers, characters, strings, … Conditionals Loops return, break, continue Functions Recursion References / pointers Objects and classes Inheritance … Which ones can we do without? What is the smallest universal language? 1 of 69 1/7/21, 8:59
cse130 file:///Users/rjhala/teaching/130-wi21/docs/lectures/03-datatypes… 32 of 46 2/2/21, 8:56 AM e0, e1, e2 :: Expr e0 = Add (Num 4.0) (Num 2.9) e1 = Sub (Num 3.78) (Num 5.92) e2 = Mul e0 e1 EXERCISE: Expression Evaluator Write a function to evaluate an expression. — >>> eval (Add (Num 4.0) (Num 2.9)) MIDTERM ON am Tue —
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cse130 file:///Users/rjhala/teaching/130-wi21/docs/lectures/04-hof.html 13 of 35 2/9/21, 8:58 AM filter The ¡°map¡± pattern The map Pattern General Pattern HOF map Apply a transformation f to each element of a list Specific Operations Transformations toUpper and \x -> x * x map f [] = [] map f (x:xs) = f x : map f xs Lets
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cse130 QUIZ ajb i a https://ucsd-cse130.github.io/wi21/lectures/01-lambda.html ((\x -> (x (\x -> x))) apple) ix s.ec =b> ??? er e Ex ez A. (apple (\x -> x)) t fix funcGE B. (apple (\apple -> apple)) C. (apple (\x -> apple)) D. apple E. (\x -> x) x Ix def 123 33 6 EXERCISE What is a
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cse130 https://ucsd-cse130.github.io/wi21/lectures/05-environments.html 1 of 41 2/16/21, 8:50 AM Environments Past three weeks Nypd How to use essential language constructs? Python Data Types Recursion Higher-Order eFunctions Next two weeks Interpreter map filter fold Passin op as param How to implement language constructs? Local variables and scope Environments and Closures (skip) Type Inference PARSING TEXT PROG How
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cse130 https://ucsd-cse130.github.io/wi21/lectures/05-environments.html 25 of 41 2/16/21, 8:50 AM Nano: Functions Let¡¯s add lambda abstraction (aka function definitions) application (aka function calls) se e ::= n |e1`op`e2 |x |letx=e1ine2 formal body | \x -> e | e1 e2 funerary Example letincr=\x->x+1 in incr 10 Representation — OLD formal FunDef Ix a body Fun Call 1 Ez
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Typeclasses Announcements HW 04-NANO – deadline ===> May 31, 23:59:59 “`haskell let fac = – env0 -> if n 2.9+3.5 6.4 Overloading Comparisons Similarly we can compare dierent types of values λ>2==3 False λ> [2.9, 3.5] == [2.9, 3.5] True λ> (“cat”, 10) < ("cat", 2) False λ> (“cat”, 10) < ("cat", 20) True Ad-Hoc
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cse130 https://ucsd-cse130.github.io/wi21/lectures/05-environments.html 2. Nano: Variables e Let¡¯s add variables and let bindings! e ::= n | e1 + e2 | e1 – e2 | e1 * e2 |x | let x = e1 in e2 IT Lets extend our datatype type Id = String data Expr = ENum Int | EBin Binop Expr Expr |
cse130 https://ucsd-cse130.github.io/wi21/lectures/02-haskell.html FixPOINT COMBINATOR Haskell Crash Course Part I From the Lambda Calculus to Haskell 1 of 31 1/19/21, 8:51 AM Recursion What is Haskell? A typed, lazy, purely functional programming language Haskell = ¦Ë-calculus ++ better syntax i I types Two NE TWO if x f f x ONE IfXsf cse130 I https://ucsd-cse130.github.io/wi21/lectures/02-haskell.html 2
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