HASKELL

HASKELL

1. Purely funcional programming language

   • Statically typed
   • Uses ghci
   • His extension is .hs

2. Functions

   • Prefix
     • Explicit call
   • infix
   • declaration then parameters then =
   • Allways starts with lowercase
   • Definition
     • No parameter(s)
   • Cycle
   • Repeat

3. Control statements

   • Operators < > = ==
   • The else is mandatory
   • The function always performs a return

4. Data structures

   • Lists
     • Strings
       • !! for get something on an index
     • Are homogeneous
     • Declaration
       • Square brackets and comas
     • Concatenated by ++
       • It's not good for long lists
       • Es mejor usar :
         • Agrega al principio
     • Functions
       • head
       • tail
       • Last
       • Init
       • length
       • null
       • reverse
       • take
       • drop n elements
       • maximum minimum
     • list comprehension
       • Build sets
         • [output_function|input_set,predicate]
           • Predicate = filtering
             • Could be more than 1

5. infers the data types

6. Ranges

   • Enumerable things
     • Numbers
       • [1..20]
         • [2,4..20]
         • [20..1]
       • Integers/Decimals
     • Letters
       • ['A'..'Z']

7. Tuples

   • Fixed size
   • Don't have to be homogeneous
   • In parenthesis inside swuared brakets
     • [(2,2),(3,3),(4,4)]
   • Functions
     • Fst
     • snd
     • zip
       • list of pairs