lean into examples

examples/environment-variables/environment-variables.go

@@ -0,0 +1,24 @@
+package main
+
+// Use the `os` package to list, set, and get environment
+// variables.
+import "os"
+import "strings"
+import "fmt"
+
+func main() {
+    // `os.Environ` returns a slice of strings in the form
+    // `KEY=value`. You can `strings.Split` them to get
+    // the key and value.
+    for _, e := range os.Environ() {
+        pair := strings.Split(e, "=")
+        fmt.Println(pair[0])
+    }
+    fmt.Println()
+
+    // `Setenv` sets a given key, value pair.
+    // `Getenv` returns the value at key, or an empty
+    // string if the key isn't present.
+    os.Setenv("FOO", "bar")
+    fmt.Println(os.Getenv("FOO"))
+}

examples/environment-variables/environment-variables.sh

@@ -0,0 +1,6 @@
+$ go run environment-variables.go
+HOME
+PATH
+PWD
+...
+bar