2022-12-03

chapter-2/03_const.go

@@ -0,0 +1,33 @@
+// constants are used to give names to literals
+// There is no way to declare that a value is immutable
+// Use constants for hard-coded package level variables
+
+// constants can be typed or untyped
+// leave them untyped for flexibility (can use an untyped int constant in a func that takes a float etc)
+// or hardcode them if needed
+
+package main
+
+import "fmt"
+
+const x int = 10
+
+const (
+	idKey   = "id"
+	nameKey = "name"
+)
+
+const z = 20 * 10
+
+func main() {
+	const y = "hello"
+
+	fmt.Println(x)
+	fmt.Println(y)
+
+	x = x + 1
+	y = "bye"
+
+	fmt.Println(x)
+	fmt.Println(y)
+}