# get-value [![NPM version](https://img.shields.io/npm/v/get-value.svg?style=flat)](https://www.npmjs.com/package/get-value) [![NPM monthly downloads](https://img.shields.io/npm/dm/get-value.svg?style=flat)](https://npmjs.org/package/get-value) [![NPM total downloads](https://img.shields.io/npm/dt/get-value.svg?style=flat)](https://npmjs.org/package/get-value) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/get-value.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/get-value) > Use property paths like 'a.b.c' to get a nested value from an object. Even works when keys have dots in them (no other dot-prop library can do this!). Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support. ## Table of Contents

Details

- [Install](#install) - [Usage](#usage) * [Supports keys with dots](#supports-keys-with-dots) * [Supports arrays](#supports-arrays) * [Supports functions](#supports-functions) * [Supports passing object path as an array](#supports-passing-object-path-as-an-array) - [Options](#options) * [options.default](#optionsdefault) * [options.isValid](#optionsisvalid) * [options.split](#optionssplit) * [options.separator](#optionsseparator) * [options.join](#optionsjoin) * [options.joinChar](#optionsjoinchar) - [Benchmarks](#benchmarks) * [Running the benchmarks](#running-the-benchmarks) - [Release history](#release-history) * [v3.0.0](#v300) - [About](#about)

## Install Install with [npm](https://www.npmjs.com/): ```sh $ npm install --save get-value ``` ## Usage See the [unit tests](test/test.js) for many more examples. ```js const get = require('foo'); const obj = { a: { b: { c: { d: 'foo' } } } }; console.log(get(obj)); //=> { a: { b: { c: { d: 'foo' } } } }; console.log(get(obj, 'a')); //=> { b: { c: { d: 'foo' } } } console.log(get(obj, 'a.b')); //=> { c: { d: 'foo' } } console.log(get(obj, 'a.b.c')); //=> { d: 'foo' } console.log(get(obj, 'a.b.c.d')); //=> 'foo' ``` ### Supports keys with dots Unlike other dot-prop libraries, get-value works when keys have dots in them: ```js console.log(get({ 'a.b': { c: 'd' } }, 'a.b.c')); //=> 'd' console.log(get({ 'a.b': { c: { 'd.e': 'f' } } }, 'a.b.c.d.e')); //=> 'f' ``` ### Supports arrays ```js console.log(get({ a: { b: { c: { d: 'foo' } } }, e: [{ f: 'g' }, { f: 'h' }] }, 'e.1.f')); //=> 'h' console.log(get({ a: { b: [{ c: 'd' }] } }, 'a.b.0.c')); //=> 'f' console.log(get({ a: { b: [{ c: 'd' }, { e: 'f' }] } }, 'a.b.1.e')); //=> 'f' ``` ### Supports functions ```js function foo() {} foo.bar = { baz: 'qux' }; console.log(get(foo)); //=> { [Function: foo] bar: { baz: 'qux' } } console.log(get(foo, 'bar')); //=> { baz: 'qux' } console.log(get(foo, 'bar.baz')); //=> qux ``` ### Supports passing object path as an array Slighly improve performance by passing an array of strings to use as object path segments (this is also useful when you need to dynamically build up the path segments): ```js console.log(get({ a: { b: 'c' } }, ['a', 'b'])); //=> 'c' ``` ## Options ### options.default **Type**: `any` **Default**: `undefined` The default value to return when get-value cannot resolve a value from the given object. ```js const obj = { foo: { a: { b: { c: { d: 'e' } } } } }; console.log(get(obj, 'foo.a.b.c.d', { default: true })); //=> 'e' console.log(get(obj, 'foo.bar.baz', { default: true })); //=> true console.log(get(obj, 'foo.bar.baz', { default: false })); //=> false console.log(get(obj, 'foo.bar.baz', { default: null })); //=> null // you can also pass the default value as the last argument // (this is necessary if the default value is an object) console.log(get(obj, 'foo.a.b.c.d', true)); //=> 'e' console.log(get(obj, 'foo.bar.baz', true)); //=> true console.log(get(obj, 'foo.bar.baz', false)); //=> false console.log(get(obj, 'foo.bar.baz', null)); //=> null ``` ### options.isValid **Type**: `function` **Default**: `true` If defined, this function is called on each resolved value. Useful if you want to do `.hasOwnProperty` or `Object.prototype.propertyIsEnumerable`. ```js const isEnumerable = Object.prototype.propertyIsEnumerable; const options = { isValid: (key, obj) => isEnumerable.call(obj, key) }; const obj = {}; Object.defineProperty(obj, 'foo', { value: 'bar', enumerable: false }); console.log(get(obj, 'foo', options)); //=> undefined console.log(get({}, 'hasOwnProperty', options)); //=> undefined console.log(get({}, 'constructor', options)); //=> undefined // without "isValid" check console.log(get(obj, 'foo', options)); //=> bar console.log(get({}, 'hasOwnProperty', options)); //=> [Function: hasOwnProperty] console.log(get({}, 'constructor', options)); //=> [Function: Object] ``` ### options.split **Type**: `function` **Default**: `String.split()` Custom function to use for splitting the string into object path segments. ```js const obj = { 'a.b': { c: { d: 'e' } } }; // example of using a string to split the object path const options = { split: path => path.split('/') }; console.log(get(obj, 'a.b/c/d', options)); //=> 'e' // example of using a regex to split the object path // (removing escaped dots is unnecessary, this is just an example) const options = { split: path => path.split(/\\?\./) }; console.log(get(obj, 'a\\.b.c.d', options)); //=> 'e' ``` ### options.separator **Type**: `string|regex` **Default**: `.` The separator to use for spliting the string (this is probably not needed when `options.split` is used). ```js const obj = { 'a.b': { c: { d: 'e' } } }; console.log(get(obj, 'a.b/c/d', { separator: '/' })); //=> 'e' console.log(get(obj, 'a\\.b.c.d', { separator: /\\?\./ })); //=> 'e' ``` ### options.join **Type**: `function` **Default**: `Array.join()` Customize how the object path is created when iterating over path segments. ```js const obj = { 'a/b': { c: { d: 'e' } } }; const options = { // when segs === ['a', 'b'] use a "/" to join, otherwise use a "." join: segs => segs.join(segs[0] === 'a' ? '/' : '.') }; console.log(get(obj, 'a.b.c.d', options)); //=> 'e' ``` ### options.joinChar **Type**: `string` **Default**: `.` The character to use when re-joining the string to check for keys with dots in them (this is probably not needed when `options.join` is used). This can be a different value than the separator, since the separator can be a string or regex. ```js const target = { 'a-b': { c: { d: 'e' } } }; const options = { joinChar: '-' }; console.log(get(target, 'a.b.c.d', options)); //=> 'e' ``` ## Benchmarks _(benchmarks were run on a MacBook Pro 2.5 GHz Intel Core i7, 16 GB 1600 MHz DDR3)_. get-value is more reliable and has more features than dot-prop, without sacrificing performance. ``` # deep (175 bytes) dot-prop x 883,166 ops/sec ±0.93% (86 runs sampled) get-value x 1,448,928 ops/sec ±1.53% (87 runs sampled) getobject x 213,797 ops/sec ±0.85% (90 runs sampled) object-path x 184,347 ops/sec ±2.48% (85 runs sampled) fastest is get-value (by 339% avg) # root (210 bytes) dot-prop x 3,905,828 ops/sec ±1.36% (87 runs sampled) get-value x 16,391,934 ops/sec ±1.43% (83 runs sampled) getobject x 1,200,021 ops/sec ±1.81% (88 runs sampled) object-path x 2,788,494 ops/sec ±1.81% (86 runs sampled) fastest is get-value (by 623% avg) # shallow (84 bytes) dot-prop x 2,553,558 ops/sec ±0.89% (89 runs sampled) get-value x 3,070,159 ops/sec ±0.88% (90 runs sampled) getobject x 726,670 ops/sec ±0.81% (86 runs sampled) object-path x 922,351 ops/sec ±2.05% (86 runs sampled) fastest is get-value (by 219% avg) ``` ### Running the benchmarks Clone this library into a local directory: ```sh $ git clone https://github.com/jonschlinkert/get-value.git ``` Then install devDependencies and run benchmarks: ```sh $ npm install && node benchmark ``` ## Release history ### v3.0.0 * Improved support for escaping. It's no longer necessary to use backslashes to escape keys. * Adds `options.default` for defining a default value to return when no value is resolved. * Adds `options.isValid` to allow the user to check the object after each iteration. * Adds `options.separator` for customizing character to split on. * Adds `options.split` for customizing how the object path is split. * Adds `options.join` for customizing how the object path is joined when iterating over path segments. * Adds `options.joinChar` for customizing the join character. ## About

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).

Running Tests

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command: ```sh $ npm install && npm test ```

Building docs

_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_ To generate the readme, run the following command: ```sh $ npm install -g verbose/verb#dev verb-generate-readme && verb ```

### Related projects You might also be interested in these projects: * [has-any-deep](https://www.npmjs.com/package/has-any-deep): Return true if `key` exists deeply on the given object. | [homepage](https://github.com/jonschlinkert/has-any-deep "Return true if `key` exists deeply on the given object. ") * [has-any](https://www.npmjs.com/package/has-any): Returns true if an object has any of the specified keys. | [homepage](https://github.com/jonschlinkert/has-any "Returns true if an object has any of the specified keys.") * [has-value](https://www.npmjs.com/package/has-value): Returns true if a value exists, false if empty. Works with deeply nested values using… [more](https://github.com/jonschlinkert/has-value) | [homepage](https://github.com/jonschlinkert/has-value "Returns true if a value exists, false if empty. Works with deeply nested values using object paths.") * [set-value](https://www.npmjs.com/package/set-value): Create nested values and any intermediaries using dot notation (`'a.b.c'`) paths. | [homepage](https://github.com/jonschlinkert/set-value "Create nested values and any intermediaries using dot notation (`'a.b.c'`) paths.") * [unset-value](https://www.npmjs.com/package/unset-value): Delete nested properties from an object using dot notation. | [homepage](https://github.com/jonschlinkert/unset-value "Delete nested properties from an object using dot notation.") ### Contributors | **Commits** | **Contributor** | | --- | --- | | 81 | [jonschlinkert](https://github.com/jonschlinkert) | | 2 | [ianwalter](https://github.com/ianwalter) | | 1 | [doowb](https://github.com/doowb) | ### Author **Jon Schlinkert** * [LinkedIn Profile](https://linkedin.com/in/jonschlinkert) * [GitHub Profile](https://github.com/jonschlinkert) * [Twitter Profile](https://twitter.com/jonschlinkert) ### License Copyright © 2018, [Jon Schlinkert](https://github.com/jonschlinkert). Released under the [MIT License](LICENSE). *** _This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on March 07, 2018._

	Stars	Issues	Version	Updated	Created
dot-prop	793	5	8.0.2	9 months ago	9 years ago
get-value	242	8	3.0.1	6 years ago	10 years ago
lodash	58,895	71	4.17.21	3 years ago	12 years ago
lodash.get	58,895	71	4.4.2	8 years ago	9 years ago
selectn	195	10	1.1.2	7 years ago	11 years ago

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