Map

A map is represented as a key/value pair.

Example Resource

The Terraform Resource digitalocean_loadbalancer (truncated for brevity)

...
forwarding_rule {
  entry_port     = 80
  entry_protocol = "http"

  target_port     = 80
  target_protocol = "http"
}
...

The keys entry_port, entry_protocol, target_port and target_protocol above and their respective values, 80, and http.

Source Code

The corresponding source code

"forwarding_rule": {
  Type:     schema.TypeSet,
  Required: true,
  MinItems: 1,
  Elem: &schema.Resource{
   Schema: map[string]*schema.Schema{
    "entry_protocol": {
  Type:     schema.TypeString,
  Required: true,
  ValidateFunc: validation.StringInSlice([]string{
   "http",
   "https",
   "http2",
   "http3",
   "tcp",
   "udp",
  }, false),
    },
    "entry_port": {
  Type:         schema.TypeInt,
  Required:     true,
  ValidateFunc: validation.IntBetween(1, 65535),
    },
    "target_protocol": {
  Type:     schema.TypeString,
  Required: true,
  ValidateFunc: validation.StringInSlice([]string{
   "http",
   "https",
   "http2",
   "tcp",
   "udp",
  }, false),
    },
    "target_port": {
  Type:         schema.TypeInt,
  Required:     true,
  ValidateFunc: validation.IntBetween(1, 65535),
    },
    "certificate_id": {
  Type:         schema.TypeString,
  Optional:     true,
  ValidateFunc: validation.NoZeroValues,
    },
    "tls_passthrough": {
  Type:     schema.TypeBool,
  Optional: true,
  Default:  false,
    },
   },
  },
  Set: hashForwardingRules,
  },

References

Terraform Docs