diff options
Diffstat (limited to 'elixir.html.markdown')
| -rw-r--r-- | elixir.html.markdown | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/elixir.html.markdown b/elixir.html.markdown index c0544982..2e9aa5a1 100644 --- a/elixir.html.markdown +++ b/elixir.html.markdown @@ -5,7 +5,12 @@ author_url: http://github.com/mrshankly filename: learnelixir.ex --- -```elixir +Elixir is a modern functional language built on top of the Erlang VM. +It's fully compatible with Erlang, but features a more standard syntax +and many more features. + +```ruby + # Single line comments start with a hashtag. # There's no multi-line comment, @@ -52,7 +57,7 @@ tail #=> [2,3] # A pattern match will error when the sides don't match, in this example # the tuples have different sizes. -{a, b, c} = {1, 2} #=> ** (MatchError) no match of right hand side value: {1,2} +# {a, b, c} = {1, 2} #=> ** (MatchError) no match of right hand side value: {1,2} # There's also binaries <<1,2,3>> # binary @@ -107,7 +112,7 @@ rem(10, 3) #=> 1 # These operators expect a boolean as their first argument. true and true #=> true false or true #=> true -1 and true #=> ** (ArgumentError) argument error +# 1 and true #=> ** (ArgumentError) argument error # Elixir also provides `||`, `&&` and `!` which accept arguments of any type. # All values except `false` and `nil` will evaluate to true. @@ -130,7 +135,7 @@ nil && 20 #=> nil 1 < :hello #=> true # The overall sorting order is defined below: -number < atom < reference < functions < port < pid < tuple < list < bit string +# number < atom < reference < functions < port < pid < tuple < list < bit string # To quote Joe Armstrong on this: "The actual order is not important, # but that a total ordering is well defined is important." @@ -215,7 +220,8 @@ end square = fn(x) -> x * x end square.(5) #=> 25 -# They also accept many clauses and guards. Guards let you fine tune pattern matching, +# They also accept many clauses and guards. +# Guards let you fine tune pattern matching, # they are indicated by the `when` keyword: f = fn x, y when x > 0 -> x + y @@ -244,7 +250,7 @@ defmodule Math do end Math.sum(1, 2) #=> 3 -Match.square(3) #=> 9 +Math.square(3) #=> 9 # To compile our simple Math module save it as `math.ex` and use `elixirc` # in your terminal: elixirc math.ex @@ -263,7 +269,7 @@ defmodule PrivateMath do end PrivateMath.sum(1, 2) #=> 3 -PrivateMath.do_sum(1, 2) #=> ** (UndefinedFunctionError) +# PrivateMath.do_sum(1, 2) #=> ** (UndefinedFunctionError) # Function declarations also support guards and multiple clauses: defmodule Geometry do @@ -278,7 +284,7 @@ end Geometry.area({:rectangle, 2, 3}) #=> 6 Geometry.area({:circle, 3}) #=> 28.25999999999999801048 -Geometry.area({:circle, "not_a_number"}) +# Geometry.area({:circle, "not_a_number"}) #=> ** (FunctionClauseError) no function clause matching in Geometry.area/1 # Due to immutability, recursion is a big part of elixir |