Initial data commit

Task/Deepcopy/Go/deepcopy-1.go

@@ -0,0 +1,37 @@
+package main
+
+import "fmt"
+
+// a complex data structure
+type cds struct {
+    i int            // no special handling needed for deep copy
+    s string         // no special handling
+    b []byte         // copied easily with append function
+    m map[int]bool   // deep copy requires looping
+}
+
+// a method
+func (c cds) deepcopy() *cds {
+    // copy what you can in one line
+    r := &cds{c.i, c.s, append([]byte{}, c.b...), make(map[int]bool)}
+    // populate map with a loop
+    for k, v := range c.m {
+        r.m[k] = v
+    }
+    return r
+}
+
+// demo
+func main() {
+    // create and populate a structure
+    c1 := &cds{1, "one", []byte("unit"), map[int]bool{1: true}}
+    fmt.Println(c1)      // show it
+    c2 := c1.deepcopy()  // copy it
+    fmt.Println(c2)      // show copy
+    c1.i = 0             // change original
+    c1.s = "nil"
+    copy(c1.b, "zero")
+    c1.m[1] = false
+    fmt.Println(c1)      // show changes
+    fmt.Println(c2)      // show copy unaffected
+}