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# `dlv(obj, keypath)` [![NPM](https://img.shields.io/npm/v/dlv.svg)](https://npmjs.com/package/dlv) [![Build](https://travis-ci.org/developit/dlv.svg?branch=master)](https://travis-ci.org/developit/dlv) > 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 ### Why? 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. ### Installation `npm install --save dlv` ### Usage `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'; ``` ### Setter Counterparts - [dset](https://github.com/lukeed/dset) by [@lukeed](https://github.com/lukeed) is the spiritual "set" counterpart of `dlv` and very fast. - [bury](https://github.com/kalmbach/bury) by [@kalmbach](https://github.com/kalmbach) does the opposite of `dlv` and is implemented in a very similar manner. ### License [MIT](https://oss.ninja/mit/developit/) [preact]: https://github.com/developit/preact [tests]: https://github.com/developit/dlv/blob/master/test.js