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--- programming:elixir:hello_world [2023/04/24 13:36] – ateixeira
+++ programming:elixir:hello_world [2023/04/26 13:26] – ateixeira
@@ Line 1: / Line 1: @@
 ====== Hello world ! ======
-=====  =====
+<code elixir>
+IO.puts("Hello world!")
+# Same as IO.puts but do not add a new line at the end
+IO.write("Hello world !")
+</code>
+----
+=== Interactive Elixir Session ===
+<code elixir>
+iex
+</code>
+=== Help ===
+<code elixir>
+h
+</code>
+> Kernel is Elixir's default environment
+> In Elixir, (almost) everything is a function
+----
+==== Reading values ====
+<code elixir>
+name = IO.gets("Salut, comment tu t'appelles ? ")
+IO.write("Salut " <> name)
+</code>
+----
+==== Atom ====
+> An atom type represents a fixed constant. The atom value is simply its own name.
+<code elixir>
+# All atoms are preceded with a :
+variable = :an_atom
+</code>
+==== Cond ===
+> Cond follows the first path that evaluates to true. If no path evaluates to true, an error is raised by the runtime.
+<code elixir>
+cond do
+    x > 10 -> :this_might_be_the_way
+    y < 7 -> :or_that_might_be_the_way
+    true -> :this_is_the_default_way
+end
+</code>
+==== _ (Underscore) ====
+> When there is a _ instead of a variable or a value, it means the value will be ignored and any value will be accepted
+<code elixir>
+{_, denominator} = Float.ratio(0.25)
+# => {1, 4}
+# the variable `denominator` is bounded to the value 4
+</code>
+<code elixir>
+[1, _, 3] = [1, "toto", 3]
+# => [1, "toto", 3]
+</code>
+----
+==== For ====
+<code elixir>
+number = IO.gets("Salut, entre un nombre : ") |> String.trim() |> String.to_integer()
+for i <- 1..number do
+  IO.puts("#{i}")
+end
+</code>
+----
+> In elixir, values are not modified. Values are transformed on output.
+**Example** :
+<code elixir>
+name = "Toto"
+if (name == "Toto") do
+  IO.puts("Inside condition before name being changed: " <> name)
+  name = "Robin"
+  IO.puts("Inside condition after name being changed: " <> name)
+end
+IO.puts("Outside condition after name being changed: " <> name)
+</code>
+**Output** :
+<code elixir>
+Inside condition before name being changed: Toto
+Inside condition after name being changed: Robin
+Outside condition after name being changed: Toto
+</code>
+**Example with date** :
+<code elixir>
+d1 = ~D[2023-04-25]
+IO.puts(d1)
+IO.puts(Date.add(d1, 5))
+IO.puts(d1)
+</code>
+**Output** :
+<code elixir>
+-04-25
+-04-30
+-04-25
+</code>