first

course/4-structs/exercises/5-methods/code.go

@@ -0,0 +1,32 @@
+package main
+
+import "fmt"
+
+type authenticationInfo struct {
+	username string
+	password string
+}
+
+// ?
+
+// don't touch below this line
+
+func test(authInfo authenticationInfo) {
+	fmt.Println(authInfo.getBasicAuth())
+	fmt.Println("====================================")
+}
+
+func main() {
+	test(authenticationInfo{
+		username: "Google",
+		password: "12345",
+	})
+	test(authenticationInfo{
+		username: "Bing",
+		password: "98765",
+	})
+	test(authenticationInfo{
+		username: "DDG",
+		password: "76921",
+	})
+}

course/4-structs/exercises/5-methods/complete.go

@@ -0,0 +1,34 @@
+package main
+
+import "fmt"
+
+type authenticationInfo struct {
+	username string
+	password string
+}
+
+func (authInfo authenticationInfo) getBasicAuth() string {
+	return "Authorization: Basic " + authInfo.username + ":" + authInfo.password
+}
+
+// don't touch below this line
+
+func test(authInfo authenticationInfo) {
+	fmt.Println(authInfo.getBasicAuth())
+	fmt.Println("====================================")
+}
+
+func main() {
+	test(authenticationInfo{
+		username: "Google",
+		password: "12345",
+	})
+	test(authenticationInfo{
+		username: "Bing",
+		password: "98765",
+	})
+	test(authenticationInfo{
+		username: "DDG",
+		password: "76921",
+	})
+}

course/4-structs/exercises/5-methods/expected.txt

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+Authorization: Basic Google:12345
+====================================
+Authorization: Basic Bing:98765
+====================================
+Authorization: Basic DDG:76921
+====================================

course/4-structs/exercises/5-methods/readme.md

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+# Struct methods in Go
+
+While Go is **not** object-oriented, it does support methods that can be defined on structs. Methods are just functions that have a receiver. A receiver is a special parameter that syntactically goes *before* the name of the function.
+
+```go
+type rect struct {
+  width int
+  height int
+}
+
+// area has a receiver of (r rect)
+func (r rect) area() int {
+  return r.width * r.height
+}
+
+r := rect{
+  width: 5,
+  height: 10,
+}
+
+fmt.Println(r.area())
+// prints 50
+```
+
+A receiver is just a special kind of function parameter. Receivers are important because they will, as you'll learn in the exercises to come, allow us to define interfaces that our structs (and other types) can implement.
+
+## Assignment
+
+Let's clean up Textio's authentication logic. We store our user's authentication data inside an `authenticationInfo` struct. We need a method that can take that data and return a basic authorization string.
+
+The format of the string should be:
+
+```
+Authorization: Basic USERNAME:PASSWORD
+```
+
+Create a method on the `authenticationInfo` struct called `getBasicAuth` that returns the formatted string.