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merge-options [![Build Status](https://travis-ci.org/schnittstabil/merge-options.svg?branch=master)](https://travis-ci.org/schnittstabil/merge-options) [![Coverage Status](https://coveralls.io/repos/schnittstabil/merge-options/badge.svg?branch=master&service=github)](https://coveralls.io/github/schnittstabil/merge-options?branch=master) [![XO code style](https://img.shields.io/badge/code_style-XO-5ed9c7.svg)](https://github.com/sindresorhus/xo)\n\n\n> Merge Option Objects\n\n`merge-options` considers [plain objects](https://github.com/sindresorhus/is-plain-obj) as *Option Objects*, everything else as *Option Values*.\n\n## Install\n\n```\n$ npm install --save merge-options\n```\n\n## Usage\n\n```js\nconst mergeOptions = require('merge-options');\n\nmergeOptions({foo: 0}, {bar: 1}, {baz: 2}, {bar: 3})\n//=> {foo: 0, bar: 3, baz: 2}\n\nmergeOptions({nested: {unicorns: 'none'}}, {nested: {unicorns: 'many'}})\n//=> {nested: {unicorns: 'many'}}\n\nmergeOptions({[Symbol.for('key')]: 0}, {[Symbol.for('key')]: 42})\n//=> {Symbol(key): 42}\n```\n\n### Usage with custom config\n\n```js\nconst mergeOptions = require('merge-options').bind({ignoreUndefined: true});\n\nmergeOptions({foo: 'bar'}, {foo: undefined})\n//=> {foo: 'bar'}\n```\n\n## API\n\n### mergeOptions(option1, ...options)
mergeOptions.call(config, option1, ...options)
mergeOptions.apply(config, [option1, ...options])\n\n`mergeOptions` recursively merges one or more *Option Objects* into a new one and returns that. The `options` are merged in order, thus *Option Values* of additional `options` take precedence over previous ones.\n\nThe merging does not alter the passed `option` arguments, taking roughly the following steps:\n* recursively cloning[1] *Option Objects* and [arrays](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray) until reaching *Option Values*\n* copying[1] references to *Option Values* to the result object\n\n\n```js\nconst defaultOpts = {\n\tfn: () => false, // functions are Option Values\n\tpromise: Promise.reject(new Error()), // all non-plain objects are Option Values\n\tarray: ['foo'], // arrays are Option Values\n\tnested: {unicorns: 'none'} // {…} is plain, therefore an Option Object\n};\n\nconst opts = {\n\tfn: () => true, // [1]\n\tpromise: Promise.resolve('bar'), // [2]\n\tarray: ['baz'], // [3]\n\tnested: {unicorns: 'many'} // [4]\n};\n\nmergeOptions(defaultOpts, opts)\n//=>\n{\n\tfn: [Function], // === [1]\n\tpromise: Promise { 'bar' }, // === [2]\n\tarray: ['baz'], // !== [3] (arrays are cloned)\n\tnested: {unicorns: 'many'} // !== [4] (Option Objects are cloned)\n}\n```\n\n#### config\n\nType: `object`\n\n##### config.concatArrays\n\nType: `boolean`
Default: `false`\n\nConcatenate arrays:\n\n```js\nmergeOptions({src: ['src/**']}, {src: ['test/**']})\n//=> {src: ['test/**']}\n\n// Via call\nmergeOptions.call({concatArrays: true}, {src: ['src/**']}, {src: ['test/**']})\n//=> {src: ['src/**', 'test/**']}\n\n// Via apply\nmergeOptions.apply({concatArrays: true}, [{src: ['src/**']}, {src: ['test/**']}])\n//=> {src: ['src/**', 'test/**']}\n```\n\n##### config.ignoreUndefined\n\nType: `boolean`
Default: `false`\n\nIgnore undefined values:\n\n```js\nmergeOptions({foo: 'bar'}, {foo: undefined})\n//=> {foo: undefined}\n\n// Via call\nmergeOptions.call({ignoreUndefined: true}, {foo: 'bar'}, {foo: undefined})\n//=> {foo: 'bar'}\n\n// Via apply\nmergeOptions.apply({ignoreUndefined: true}, [{foo: 'bar'}, {foo: undefined}])\n//=> {foo: 'bar'}\n```\n\n\n## Related\n\n* See [object-assign](https://github.com/sindresorhus/object-assign) if you need a ES2015 Object.assign() ponyfill\n* See [deep-assign](https://github.com/sindresorhus/deep-assign) if you need to do Object.assign() recursively\n\n## Notes\n\n
    \n\t
  1. copying and cloning take only enumerable own properties into account
    2. \n
\n\n## License\n\nMIT © [Michael Mayer](http://schnittstabil.de)\n","_attachments":{},"homepage":"https://github.com/schnittstabil/merge-options#readme","bugs":{"url":"https://github.com/schnittstabil/merge-options/issues"},"license":"MIT"}