add echo

src/content/chapter0_basics/lesson04_type_checking/code.gleam

@@ -3,5 +3,8 @@ import gleam/io
 pub fn main() {
   io.println("My lucky number is:")
   // io.println(4)
-  // 👆️ Uncomment this line
+  // 👆️ Uncomment this line to see the error
+
+  // echo 4
+  // 👆️ You can use `echo` to debug print a value of any type!
 }

src/content/chapter0_basics/lesson04_type_checking/en.html

@@ -15,11 +15,8 @@
   function only works with strings, not ints.
 </p>
 <p>
-  To fix the code change the code to call the 
-  <a href="https://hexdocs.pm/gleam_stdlib/gleam/io.html#debug" target="_blank">
-    <code>io.debug</code>
-  </a> 
-  function instead, as it will print a value of any type.
+  If you need to debug print something you can use the <code>echo</code>
+  keyword instead, as it will print a value of any type.
 </p>
 <p>
   Gleam has no <code>null</code>, no implicit conversions, no exceptions, and

src/content/chapter0_basics/lesson16_blocks/en.html

@@ -7,11 +7,8 @@
   Any variables assigned within the block can only be used within the block.
 </p>
 <p>
-  Try uncommenting 
-  <a href="https://hexdocs.pm/gleam_stdlib/gleam/io.html#debug" target="_blank">
-    <code>io.debug(degrees)</code>
-  </a> 
-  to see the compile error from trying to use a variable that is not in scope.
+  Try uncommenting <code>echo degrees</code> to see the compile error from
+  trying to use a variable that is not in scope.
 </p>
 <p>
   Blocks can also be used to change the order of evaluation of binary operators

src/content/chapter1_functions/lesson07_pipelines/code.gleam

@@ -8,12 +8,14 @@ pub fn main() {
   // With the pipe operator
   "Hello, Mike!"
   |> string.drop_right(1)
+  |> echo
   |> string.drop_left(7)
   |> io.println
 
   // Changing order with function capturing
   "1"
   |> string.append("2")
+  |> echo
   |> string.append("3", _)
   |> io.println
 }

src/content/chapter1_functions/lesson07_pipelines/en.html

@@ -23,3 +23,7 @@
   position then a function capture can be used to insert the argument to the
   desired position.
 </p>
+<p>
+  If you need to debug print a value in the middle of a pipeline you can use
+  <code>|> echo</code> to do it.
+</p>

src/content/chapter3_data_types/lesson04_record_pattern_matching/code.gleam

@@ -16,14 +16,14 @@ pub fn main() {
 
 fn handle_fish(fish: Fish) {
   case fish {
-    Starfish(_, favourite_color) -> io.debug(favourite_color)
-    Jellyfish(name, ..) -> io.debug(name)
+    Starfish(_, favourite_color) -> io.println(favourite_color)
+    Jellyfish(name, ..) -> io.println(name)
   }
 }
 
 fn handle_ice_cream(ice_cream: IceCream) {
   // if the custom type has a single variant you can
   // destructure it using `let` instead of a case expression!
   let IceCream(flavour) = ice_cream
-  echo flavour
+  io.println(flavour)
 }

src/tour.gleam

@@ -60,11 +60,8 @@ const home_html = "
   <a href=\"https://hexdocs.pm/gleam_stdlib/gleam/io.html#print\" target=\"_blank\">
     <code>io.println</code>
   </a> 
-  or 
-  <a href=\"https://hexdocs.pm/gleam_stdlib/gleam/io.html#debug\" target=\"_blank\">
-    <code>io.debug</code>
-  </a> 
-  will be shown in the bottom section, along with any compile errors and warnings. 
+  or <code>echo</code> will be shown in the bottom section, along with any compile
+  errors and warnings. 
   To evaluate Gleam code the tour compiles Gleam to JavaScript and runs it, 
   all entirely within your browser window.
 </p>