125 lines
2.6 KiB
Markdown
125 lines
2.6 KiB
Markdown
# dot-prop [](https://travis-ci.com/github/sindresorhus/dot-prop)
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> Get, set, or delete a property from a nested object using a dot path
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## Install
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```
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$ npm install dot-prop
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```
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## Usage
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```js
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const dotProp = require('dot-prop');
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// Getter
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dotProp.get({foo: {bar: 'unicorn'}}, 'foo.bar');
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//=> 'unicorn'
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dotProp.get({foo: {bar: 'a'}}, 'foo.notDefined.deep');
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//=> undefined
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dotProp.get({foo: {bar: 'a'}}, 'foo.notDefined.deep', 'default value');
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//=> 'default value'
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dotProp.get({foo: {'dot.dot': 'unicorn'}}, 'foo.dot\\.dot');
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//=> 'unicorn'
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// Setter
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const object = {foo: {bar: 'a'}};
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dotProp.set(object, 'foo.bar', 'b');
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console.log(object);
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//=> {foo: {bar: 'b'}}
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const foo = dotProp.set({}, 'foo.bar', 'c');
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console.log(foo);
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//=> {foo: {bar: 'c'}}
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dotProp.set(object, 'foo.baz', 'x');
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console.log(object);
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//=> {foo: {bar: 'b', baz: 'x'}}
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// Has
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dotProp.has({foo: {bar: 'unicorn'}}, 'foo.bar');
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//=> true
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// Deleter
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const object = {foo: {bar: 'a'}};
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dotProp.delete(object, 'foo.bar');
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console.log(object);
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//=> {foo: {}}
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object.foo.bar = {x: 'y', y: 'x'};
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dotProp.delete(object, 'foo.bar.x');
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console.log(object);
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//=> {foo: {bar: {y: 'x'}}}
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```
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## API
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### get(object, path, defaultValue?)
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Get the value of the property at the given path.
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Returns the value if any.
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### set(object, path, value)
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Set the property at the given path to the given value.
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Returns the object.
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### has(object, path)
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Check whether the property at the given path exists.
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Returns a boolean.
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### delete(object, path)
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Delete the property at the given path.
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Returns a boolean of whether the property existed before being deleted.
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#### object
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Type: `object`
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Object to get, set, or delete the `path` value.
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You are allowed to pass in `undefined` as the object to the `get` and `has` functions.
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#### path
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Type: `string`
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Path of the property in the object, using `.` to separate each nested key.
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Use `\\.` if you have a `.` in the key.
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The following path components are invalid and results in `undefined` being returned: `__proto__`, `prototype`, `constructor`.
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#### value
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Type: `unknown`
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Value to set at `path`.
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#### defaultValue
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Type: `unknown`
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Default value.
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---
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<div align="center">
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<b>
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<a href="https://tidelift.com/subscription/pkg/npm-dot-prop?utm_source=npm-dot-prop&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
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</b>
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<br>
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<sub>
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Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
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</sub>
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</div>
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