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Feb 16, 2017
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doc: dns examples implied string args were arrays #11350

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34 changes: 23 additions & 11 deletions doc/api/dns.md
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Original file line number Diff line number Diff line change
Expand Up @@ -15,9 +15,10 @@ For example, looking up `iana.org`.
```js
const dns = require('dns');

dns.lookup('iana.org', (err, addresses, family) => {
console.log('addresses:', addresses);
dns.lookup('iana.org', (err, address, family) => {
console.log('address: %j family: IPv%s', address, family);
});
// address: "192.0.43.8" family: IPv4
```

2) Functions that connect to an actual DNS server to perform name resolution,
Expand Down Expand Up @@ -84,15 +85,7 @@ Alternatively, `options` can be an object containing these properties:
* `all`: {Boolean} - When `true`, the callback returns all resolved addresses
in an array, otherwise returns a single address. Defaults to `false`.

All properties are optional. An example usage of options is shown below.

```js
{
family: 4,
hints: dns.ADDRCONFIG | dns.V4MAPPED,
all: false
}
```
All properties are optional.

The `callback` function has arguments `(err, address, family)`. `address` is a
string representation of an IPv4 or IPv6 address. `family` is either the
Expand All @@ -115,6 +108,25 @@ important consequences on the behavior of any Node.js program. Please take some
time to consult the [Implementation considerations section][] before using
`dns.lookup()`.

Example usage:

```js
const dns = require('dns');
const options = {
family: 6,
hints: dns.ADDRCONFIG | dns.V4MAPPED,
};
dns.lookup('example.com', options, (err, address, family) =>
console.log('address: %j family: IPv%s', address, family));
// address: "2606:2800:220:1:248:1893:25c8:1946" family: IPv6

// When options.all is true, the result will be an Array.
options.all = true;
dns.lookup('example.com', options, (err, addresses) =>
console.log('addresses: %j', addresses));
// addresses: [{"address":"2606:2800:220:1:248:1893:25c8:1946","family":6}]
```

### Supported getaddrinfo flags

The following flags can be passed as hints to [`dns.lookup()`][].
Expand Down