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-rw-r--r--go.html.markdown10
1 files changed, 10 insertions, 0 deletions
diff --git a/go.html.markdown b/go.html.markdown
index 49f1ade4..0c9082c6 100644
--- a/go.html.markdown
+++ b/go.html.markdown
@@ -109,6 +109,11 @@ can include line breaks.` // Same string type.
a5 := [...]int{3, 1, 5, 10, 100} // An array initialized with a fixed size of five
// elements, with values 3, 1, 5, 10, and 100.
+ // Arrays have value semantics.
+ a4_cpy := a4 // a4_cpy is a copy of a4, two separate instances.
+ a4_cpy[0] = 25 // Only a4_cpy is changed, a4 stays the same.
+ fmt.Println(a4_cpy[0] == a4[0]) // false
+
// Slices have dynamic size. Arrays and slices each have advantages
// but use cases for slices are much more common.
s3 := []int{4, 5, 9} // Compare to a5. No ellipsis here.
@@ -116,6 +121,11 @@ can include line breaks.` // Same string type.
var d2 [][]float64 // Declaration only, nothing allocated here.
bs := []byte("a slice") // Type conversion syntax.
+ // Slices (as well as maps and channels) have reference semantics.
+ s3_cpy := s3 // Both variables point to the same instance.
+ s3_cpy[0] = 0 // Which means both are updated.
+ fmt.Println(s3_cpy[0] == s3[0]) // true
+
// Because they are dynamic, slices can be appended to on-demand.
// To append elements to a slice, the built-in append() function is used.
// First argument is a slice to which we are appending. Commonly,