Day 1
Key Points
- Scalability
- Concurrency
- Reliability
Key Points
- Your programs are going to be built entirely out of functions, with no objects anywhere.
- Those functions will usually return the same values, given the same inputs.
- Those functions will not usually have side effects, meaning they will not modify program state.
- You will only be able to assign any variable once.
Atoms
A symbol is called an atom and begins with lowercase
red.
Pill = blue.
Pill.
Lists
[1, 2, 3].
[1, 2, "three"].
List = [1, 2, 3].
Tuples
{one, two, three}.
Origin = {0, 0}.
{name, "Spaceman Spiff"}.
{comic_strip,
{name, "Calvin and Hobbes"},
{character, "Spaceman Spiff"}}.
Pattern Matching
Person = {person, {name, "Agent Smith"},
{profession, "Killing programs"}}
{person, {name, Name},
{profession, Profession}} = Person.
Pattern Matching
[Head | Tail] = [1, 2, 3].
Pattern Matching
[One, Two|Rest] = [1, 2, 3].
Functions
-module(basic).
-export([mirror/1]).
mirror(Anything) -> Anything.
Functions
-module(matching_function).
-export([number/1]).
number(one) -> 1;
number(two) -> 2;
number(three) -> 3.
Functions
module(yet_again).
-export([another_factorial/1]).
-export([another_fib/1]).
another_factorial(0) -> 1;
another_factorial(N) -> N * another_factorial(N-1).
another_fib(0) -> 1;
another_fib(1) -> 1;
another_fib(N) -> another_fib(N-1) + another_fib(N-2)
Assignment
Start the Assignment
Read Day 2
