dlv(obj, keypath)  

> Safely get a dot-notated path within a nested object, with ability to return a default if the full key path does not exist or the value is undefined

$3

Smallest possible implementation: only 130 bytes.

You could write this yourself, but then you'd have to write [tests].

Supports ES Modules, CommonJS and globals.

$3

npm install --save dlv

$3

delve(object, keypath, [default])

``js
import delve from 'dlv';

let obj = {
a: {
b: {
c: 1,
d: undefined,
e: null
}
}
};

//use string dot notation for keys
delve(obj, 'a.b.c') === 1;

//or use an array key
delve(obj, ['a', 'b', 'c']) === 1;

delve(obj, 'a.b') === obj.a.b;

//returns undefined if the full key path does not exist and no default is specified
delve(obj, 'a.b.f') === undefined;

//optional third parameter for default if the full key in path is missing
delve(obj, 'a.b.f', 'foo') === 'foo';

//or if the key exists but the value is undefined
delve(obj, 'a.b.d', 'foo') === 'foo';

//Non-truthy defined values are still returned if they exist at the full keypath
delve(obj, 'a.b.e', 'foo') === null;

//undefined obj or key returns undefined, unless a default is supplied
delve(undefined, 'a.b.c') === undefined;
delve(undefined, 'a.b.c', 'foo') === 'foo';
delve(obj, undefined, 'foo') === 'foo';
`

$3

- dset by @lukeed is the spiritual "set" counterpart of dlv and very fast.
- bury by @kalmbach does the opposite of dlv` and is implemented in a very similar manner.

$3

MIT

[preact]: https://github.com/developit/preact
[tests]: https://github.com/developit/dlv/blob/master/test.js