Switch statement

app.env.example

@@ -1,2 +1,2 @@
 IDEONE_USERNAME=<user>
-IDEONE_PASSWORD=<password>
+IDEONE_PASSWORD=<password>

tutorials/learn-golang.org/en/Switches.md

@@ -0,0 +1,139 @@
+Tutorial
+--------
+
+We've already looked at if-else statements, and we've seen that we can cascade these statements, but is there a cleaner way to do that?
+
+## switch statement
+
+A switch statement is a shorter way to write a sequence of if - else statements. It runs the first case whose value is equal to the condition expression.
+
+The general syntax is:
+
+    switch name {
+    case "Alice":
+        // Code to be executed if name is Alice
+    case "Bob":
+        // Code to be executed if name is Bob 
+    }
+
+Optionally, we can add a default statement to handle situations where none of the conditions are met:
+
+    switch name {
+    case "Alice":
+        fmt.Println("Hi Alice!")
+    case "Bob":
+        fmt.Println("Hi Bob!")
+    default:
+        fmt.Println("I don't know you!")
+    }
+
+Just like an if statement, the switch statement also provides an option to initialize a variable and test the condition within the if statement. The general syntax in this case is
+
+    switch <init>;<condition> {
+    case:
+        // code to execute if condition is true
+    }
+
+An example code is below; this will print "Hi Alice!":
+    // Initializes name by setting it to Alice
+    switch name := "Alice"; name {
+    case "Alice":
+        fmt.Println("Hi Alice!")
+    case "Bob":
+        fmt.Println("Hi Bob!")
+    default:
+        fmt.Println("I don't know you!")
+    }
+
+A switch statement can be run bare, without any variable or condition; this can be a clean way to write long if-then-else chains:
+
+    x := 10
+    switch {
+    case x == 0:
+        // Since x is 10 in this example, this case will not execute
+    case x > 5:
+        // X is 10, which is greater than 5. This case will execute.
+    case x > 0:
+        // While this case is also true, because an earlier case is true, this case will not execute
+    }
+
+Remember that cases are evaluated from top to bottom, stopping at the first case that is met. In the above example, x > 5 is the first true case, and any later cases within the switch statement are not checked. 
+
+## Example
+Let's write an example code to check if the user's name is `John` or not
+
+    userName := "Alice"
+
+    // prints Hi Alice!
+    switch userName {
+    case "Alice":
+        fmt.Println("Hi Alice!")
+    case "Bob":
+        fmt.Println("Hi Bob!")
+    default:
+        fmt.Println("I don't know you!")
+    }
+
+    // let's change the username variable
+    userName = "Bob"
+
+    // prints Hi Bob!
+    switch userName {
+    case "Alice":
+        fmt.Println("Hi Alice!")
+    case "Bob":
+        fmt.Println("Hi Bob!")
+    default:
+        fmt.Println("I don't know you!")
+    }
+
+    // let's change the username variable again
+    userName = "Matthew"
+
+    // prints I don't know you!
+    switch userName {
+    case "Alice":
+        fmt.Println("Hi Alice!")
+    case "Bob":
+        fmt.Println("Hi Bob!")
+    default:
+        fmt.Println("I don't know you!")
+    }
+
+Exercise
+--------
+In a college course, a score below 70 is considered failing, a score of 70 to 90 is considered acceptable, and a score greater than 90 is considered outstanding. Write a switch statement to check the score variable. Print `"Failing"` if the score is below 70, `"Acceptable"` if the score is between 70-90 inclusive, and `"Outstanding"` if the score is more than 90. 
+
+Tutorial Code
+-------------
+package main
+
+import "fmt"
+
+func main () {
+    score := 85
+
+    // Add your code here.
+}
+
+Expected Output
+---------------
+Acceptable
+
+Solution
+--------
+package main
+
+import "fmt"
+
+func main () {
+    score := 85
+    switch {
+    case score > 90:
+        fmt.Println("Outstanding")
+    case score >= 70:
+        fmt.Println("Acceptable")
+    case score < 70:
+        fmt.Println("Failing")
+    }
+}

tutorials/learn-golang.org/en/Welcome.md

@@ -15,6 +15,7 @@ learn-golang.org is still under construction - If you wish to contribute tutoria
 - [[Arrays]]
 - [[Slices]]
 - [[If-Else]]
+- [[Switches]]
 - [[Loops]]
 - [[Functions]]
 - [[The fmt module]]