publish structs

examples.txt

@@ -15,7 +15,7 @@ Variadic Functions
 Closures
 Recursion
 Pointers
-# Structs
+Structs
 # Methods
 # Embedding
 # Interfaces

examples/pointers/pointers.go

@@ -37,6 +37,6 @@ func main() {
     zeroptr(&i)
     fmt.Println("zeroptr:", i)
 
-	// Pointers can be printed too.
-	fmt.Println("pointer:", &i)
+    // Pointers can be printed too.
+    fmt.Println("pointer:", &i)
 }

examples/structs/structs.go

@@ -1,22 +1,37 @@
+// Go's _structs_ are typed collections of fields.
+// They're useful for grouping data together to form
+// records.
+
 package main
 
 import "fmt"
 
-type Circle struct {
-    x, y, r float64
+// This `person` struct type has `name` and `age` fields.
+type person struct {
+    name string
+    age  int
 }
 
 func main() {
-    cEmptyPtr := new(Circle)
-    fmt.Println(cEmptyPtr)
-    fmt.Println(*cEmptyPtr)
 
-    cValue := Circle{x: 1, y: 2, r: 5}
-    fmt.Println(&cValue)
-    fmt.Println(cValue)
+    // This syntax creates a new struct.
+    fmt.Println(person{"Bob", 20})
 
-    cOrdered := Circle{1, 2, 5}
-    fmt.Println(cOrdered)
+    // You can name the fields when initializing a struct.
+    fmt.Println(person{name: "Alice", age: 30})
+
+    // Omitted fields will be zero-valued.
+    fmt.Println(person{name: "Fred"})
+
+    // An `&` prefix yields a pointer to the struct.
+    fmt.Println(&person{name: "Ann", age: 40})
+
+    // Access struct fields with a dot.
+    s := person{name: "Sean", age: 50}
+    fmt.Println(s.name)
+
+    // You can also use dots with struct pointers - the
+    // pointer will be automatically dereferenced.
+    sp := &s
+    fmt.Println(sp.age)
 }
-
-// todo: add field access

examples/structs/structs.sh

@@ -0,0 +1,7 @@
+$ go run structs.go
+{Bob 20}
+{Alice 30}
+{Fred 0}
+&{Ann 40}
+Sean
+50