diff options
Diffstat (limited to 'elixir.html.markdown')
| -rw-r--r-- | elixir.html.markdown | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/elixir.html.markdown b/elixir.html.markdown index 9dfffc41..e82509e7 100644 --- a/elixir.html.markdown +++ b/elixir.html.markdown @@ -4,6 +4,7 @@ contributors: - ["Joao Marques", "http://github.com/mrshankly"] - ["Dzianis Dashkevich", "https://github.com/dskecse"] - ["Ryan Plant", "https://github.com/ryanplant-au"] + - ["Ev Bogdanov", "https://github.com/evbogdanov"] filename: learnelixir.ex --- @@ -127,7 +128,8 @@ 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 +#=> ** (BadBooleanError) expected a boolean on left-side of "and", got: 1 # Elixir also provides `||`, `&&` and `!` which accept arguments of any type. # All values except `false` and `nil` will evaluate to true. @@ -285,7 +287,11 @@ end PrivateMath.sum(1, 2) #=> 3 # PrivateMath.do_sum(1, 2) #=> ** (UndefinedFunctionError) -# Function declarations also support guards and multiple clauses: +# Function declarations also support guards and multiple clauses. +# When a function with multiple clauses is called, the first function +# that satisfies the clause will be invoked. +# Example: invoking area({:circle, 3}) will call the second area +# function defined below, not the first: defmodule Geometry do def area({:rectangle, w, h}) do w * h |