lean into examples

examples/command-line-arguments/command-line-arguments.go

@@ -0,0 +1,23 @@
+// Use `os.Args` to access command-line arguments and
+// the name of the program.
+package main
+
+import "os"
+import "fmt"
+
+func main() {
+    // `os.Args` includes the program name as the first
+    // value.
+    argsWithProg := os.Args
+    argsWithoutProg := os.Args[1:]
+
+    // `Args` are a slice, you can get individual args
+    // with normal indexing.
+    arg := os.Args[3]
+
+    fmt.Println(argsWithProg)
+    fmt.Println(argsWithoutProg)
+    fmt.Println(arg)
+}
+
+// todo: discuss building before here

examples/command-line-arguments/command-line-arguments.sh

@@ -0,0 +1,9 @@
+# Build a `command-line-args` binary so that we have
+# the expected program name.
+$ go build command-line-arguments      
+                                    
+
+$ ./command-line-arguments a b c d
+[command-line-arguments a b c d]       
+[a b c d]
+c