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Lab files from Kevin Smith's erlang training

branch: master
README.mkd

Data Types

  • atoms
    • true, hello, 'WORLD'
  • binary
    • <<"Hello World">>
    • Useful for unicode characters
  • lists
    • [1,2,3]
    • "Hello, World" (a string of characters [which are just integers])
  • tuples
    • {greeting, <<"Hello there!">>}
  • integers
    • 12345
    • max value of ram

Pattern Matching

  • Single assignment variables start with an uppercase character
  • The = operator
    • A = 10.
    • {RecordType, Car} = {car, "Challenger"}.
    • Message = "Hello, world!".

Lists

  • map (just like ruby map)
  • filter (just like ruby select)
  • List comprehension (map)
    • A = [1,2,3,4,5].
    • [X * 2 || X <- A].
    • [2,4,6,8,10]
  • List comprehension (filter)
    • A = [1,2,3,4,5].
    • [X || X <- A, X rem 2 == 0]
  • Build in reverse for constant time list insertion the use lists:reverse(List).

Functions

  • Arity (number of parameters a function takes)

Recursions

  • call function in tail position to reuse call frame (bindings)
  • last call in function is "tail"

Processes

  • Module and Process are useful for code decomposition
  • Akin to a Class

Misc

  • erlc (to compile .erl to .beam)
  • erl -pa (for load path)
  • m(module_name) gives info about module
  • c("/path/to/file.erl") or c(demo) to compile
  • _Variable (ignore variable)

Line terminators

  • Comma separates sequentially executing statements (,)

    • X = 2, X1 = X+2, X2 = X1 + 2.
  • Semicolon separates related but distinct things (;)

    • see even_or_odd
  • Period terminates a block of things or a single thing (.)
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