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150 lines
3.3 KiB
Markdown
150 lines
3.3 KiB
Markdown
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# Node.js mixme
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Merge multiple object recursively, with TypeScript support. The last object takes precedence over the previous ones. Only objects are merged. Arrays are overwritten.
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- Zero dependencies
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- Small size
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- Pure functions
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- ESM and CommonJS support
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## API
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### Function `merge(...data)`
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The API is minimalist, pass as many literal objects as you wish, they will all be merged. This function is immutable, the source objects won't be altered.
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```js
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import { merge } from 'mixme'
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const target = merge({a: '1'}, {b: '2'});
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// target is {a: '1', b: '2'}
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```
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### Function `mutate(...data)`
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Use the `mutate` function to enrich an object. The first argument will be mutated:
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```js
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import { mutate } from 'mixme'
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const source = {a: '1'};
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const target = mutate(source, {b: '2'});
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target.c = '3';
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// source and target are both {a: '1', b: '2', c: '3'}
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```
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### Function `clone(data)`
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It is possible to clone a literal object by simply calling `mixme` with this object as the first argument. Use the `clone` function in case you wish to clone any type of argument including arrays:
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```js
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import { clone } from 'mixme'
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const target = clone(['a', 'b'])
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// target is now a copy of source
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```
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### Function `is_object_literal(object)`
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Use the `is_object_literal` function to ensure an object is literate.
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```js
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import { is_object_literal } from 'mixme'
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// {} is literate
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is_object_literal({})
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// error is not literate
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is_object_literal(new Error('Catch me'))
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// Array is not literate
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is_object_literal([])
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```
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### Function `snake_case(object)`
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Clone a object and convert its properties into snake case.
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```js
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import { snake_case } from 'mixme'
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snake_case({aA: '1', bB: cC: '2'})
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// Return {a_a: '1', b_b: c_c: '2'}
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```
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### Function `compare(item_1, item_2)`
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Compare two items and return true if their values match.
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```js
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import { compare } from 'mixme'
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compare([{a: 1}], [{a: 1}])
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// Return true
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compare({a: 1}, {a: 2})
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// Return false
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```
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## Example
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Create a new object from two objects:
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```js
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import { merge } from 'mixme'
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const obj1 = { a_key: 'a value', b_key: 'b value'}
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const obj2 = { b_key: 'new b value'}
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const result = merge(obj1, obj2)
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assert.eql(result.b_key, 'new b value')
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```
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Merge an existing object with a second one:
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```js
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import { mutate } from 'mixme'
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const obj1 = { a_key: 'a value', b_key: 'b value'};
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const obj2 = { b_key: 'new b value'};
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const result = mutate(obj1, obj2)
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assert.eql(result, obj1)
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assert.eql(obj1.b_key, 'new b value')
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```
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## Testing
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Clone the repo, install the development dependencies and run the tests:
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```bash
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git clone http://github.com/wdavidw/node-mixme.git .
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npm install
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npm run test
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```
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## Developers
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To automatically generate a new version:
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```bash
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yarn run release
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git push --follow-tags origin master
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```
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Package publication is handled by the CI/CD with GitHub action.
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Note:
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- On release, both the publish and test workflows run in parallel. Not very happy about it but I haven't found a better way.
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- `yarn` does not call the "postrelease" script and `npm` fails if the `package-lock.json` file is present and git ignored.
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## Contributors
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- David Worms: <https://github.com/wdavidw>
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- Paul Farault: <https://github.com/PaulFarault>
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This package is developed by [Adaltas](https://www.adaltas.com).
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