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| author | Philipp Tanlak <philipp.tanlak@gmail.com> | 2025-11-24 20:54:57 +0100 |
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| committer | Philipp Tanlak <philipp.tanlak@gmail.com> | 2025-11-24 20:57:48 +0100 |
| commit | b1e2c8fd5cb5dfa46bc440a12eafaf56cd844b1c (patch) | |
| tree | 49d360fd6cbc6a2754efe93524ac47ff0fbe0f7d /node_modules/dlv/README.md | |
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| -rw-r--r-- | node_modules/dlv/README.md | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/node_modules/dlv/README.md b/node_modules/dlv/README.md new file mode 100644 index 0000000..6a8429d --- /dev/null +++ b/node_modules/dlv/README.md @@ -0,0 +1,76 @@ +# `dlv(obj, keypath)` [](https://npmjs.com/package/dlv) [](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 |