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105 lines
2.2 KiB
Markdown
105 lines
2.2 KiB
Markdown
# map-obj
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> Map object keys and values into a new object
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## Install
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```sh
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npm install map-obj
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```
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## Usage
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```js
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const mapObject = require('map-obj');
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const newObject = mapObject({foo: 'bar'}, (key, value) => [value, key]);
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//=> {bar: 'foo'}
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const newObject = mapObject({FOO: true, bAr: {bAz: true}}, (key, value) => [key.toLowerCase(), value]);
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//=> {foo: true, bar: {bAz: true}}
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const newObject = mapObject({FOO: true, bAr: {bAz: true}}, (key, value) => [key.toLowerCase(), value], {deep: true});
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//=> {foo: true, bar: {baz: true}}
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const newObject = mapObject({one: 1, two: 2}, (key, value) => value === 1 ? [key, value] : mapObject.mapObjectSkip);
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//=> {one: 1}
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```
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## API
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### mapObject(source, mapper, options?)
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#### source
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Type: `object`
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Source object to copy properties from.
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#### mapper
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Type: `(sourceKey, sourceValue, source) => [targetKey, targetValue, mapperOptions?] | mapObject.mapObjectSkip`
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Mapping function.
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##### mapperOptions
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Type: `object`
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###### shouldRecurse
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Type: `boolean`\
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Default: `true`
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Whether `targetValue` should be recursed.
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Requires `deep: true`.
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#### options
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Type: `object`
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##### deep
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Type: `boolean`\
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Default: `false`
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Recurse nested objects and objects in arrays.
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##### target
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Type: `object`\
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Default: `{}`
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Target object to map properties on to.
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### mapObject.mapObjectSkip
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Return this value from a `mapper` function to exclude the key from the new object.
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```js
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const mapObject = require('map-obj');
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const object = {one: 1, two: 2}
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const mapper = (key, value) => value === 1 ? [key, value] : mapObject.mapObjectSkip
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const result = mapObject(object, mapper);
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console.log(result);
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//=> {one: 1}
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```
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## Related
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- [filter-obj](https://github.com/sindresorhus/filter-obj) - Filter object keys and values into a new object
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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-map-obj?utm_source=npm-map-obj&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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