Syntax in Functions

Syntax in Functions

1. Pattern matching

   • when writing functions
     • you define separate function bodies for different patterns
   • checked from top to bottom
   • First: to specify the most specific ones first
     • After: the more general ones
   • Wanna avoid crashes??
     • Include a catch-all pattern
   • Some uses
     • Tuples
     • List comprehensions
     • Lists
       • x:xs
         • x -> head
         • xs:tail
   • Using @
     • xs@(x:y:ys)
   • Patterns
     • to which some data should conform

2. Guards

   • like IF, ELSE
     • Some property of a value is?
       • True
       • False
   • Not = after the function

3. Where

   • Avoid repetitions of code
   • Always after guards
   • Bind to names or functions

4. Let

   • Expressions
     • Bind to variables at the end of a function
       • More than one variable?
         • separate by ;
   • Sintaxis
     • let <bindings> in <expression>

5. Case expressions

   • like switch-case in java
   • Similar to:
     • pattern matching on parameters in function definitions
   • Sintaxis
     • case expression of pattern -> result
       • expression is matched against the patterns.