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writing deep Object values~!\n\nFor _accessing_ deep object properties, please see [`dlv`](https://github.com/developit/dlv).\n\n> **Using GraphQL?** You may want `dset/merge` – see [Merging](#merging) for more info.\n\n## Install\n\n```sh\n$ npm install --save dset\n```\n\n## Modes\n\nThere are two \"versions\" of `dset` available:\n\n#### `dset`\n> **Size (gzip):** 197 bytes
\n> **Availability:** [CommonJS](https://unpkg.com/dset/dist/index.js), [ES Module](https://unpkg.com/dset/dist/index.mjs), [UMD](https://unpkg.com/dset/dist/index.min.js)\n\n```js\nimport { dset } from 'dset';\n```\n\n#### `dset/merge`\n> **Size (gzip):** 307 bytes
\n> **Availability:** [CommonJS](https://unpkg.com/dset/merge/index.js), [ES Module](https://unpkg.com/dset/merge/index.mjs), [UMD](https://unpkg.com/dset/merge/index.min.js)\n\n```js\nimport { dset } from 'dset/merge';\n```\n\n\n## Usage\n\n```js\nimport { dset } from 'dset';\n\nlet foo = { abc: 123 };\ndset(foo, 'foo.bar', 'hello');\n// or: dset(foo, ['foo', 'bar'], 'hello');\nconsole.log(foo);\n//=> {\n//=> abc: 123,\n//=> foo: { bar: 'hello' },\n//=> }\n\ndset(foo, 'abc.hello', 'world');\n// or: dset(foo, ['abc', 'hello'], 'world');\nconsole.log(foo);\n//=> {\n//=> abc: { hello: 'world' },\n//=> foo: { bar: 'hello' },\n//=> }\n\nlet bar = { a: { x: 7 }, b:[1, 2, 3] };\ndset(bar, 'b.1', 999);\n// or: dset(bar, ['b', 1], 999);\n// or: dset(bar, ['b', '1'], 999);\nconsole.log(bar);\n//=> {\n//=> a: { x: 7 },\n//=> b: [1, 999, 3],\n//=> }\n\ndset(bar, 'a.y.0', 8);\n// or: dset(bar, ['a', 'y', 0], 8);\n// or: dset(bar, ['a', 'y', '0'], 8);\nconsole.log(bar);\n//=> {\n//=> a: {\n//=> x: 7,\n//=> y: [8],\n//=> },\n//=> b: [1, 999, 3],\n//=> }\n\nlet baz = {};\ndset(baz, 'a.0.b.0', 1);\ndset(baz, 'a.0.b.1', 2);\nconsole.log(baz);\n//=> {\n//=> a: [{ b: [1, 2] }]\n//=> }\n```\n\n## Merging\n\nThe main/default `dset` module forcibly writes values at the assigned key-path. However, in some cases, you may prefer to _merge_ values at the key-path. For example, when using [GraphQL's `@stream` and `@defer` directives](https://foundation.graphql.org/news/2020/12/08/improving-latency-with-defer-and-stream-directives/), you will need to merge the response chunks into a single object/list. This is why `dset/merge` exists~!\n\nBelow is a quick illustration of the difference between `dset` and `dset/merge`:\n\n```js\nlet input = {\n hello: {\n abc: 123\n }\n};\n\ndset(input, 'hello', { world: 123 });\nconsole.log(input);\n\n// via `dset`\n//=> {\n//=> hello: {\n//=> world: 123\n//=> }\n//=> }\n\n// via `dset/merge`\n//=> {\n//=> hello: {\n//=> abc: 123,\n//=> world: 123\n//=> }\n//=> }\n```\n\n\n## Immutability\n\nAs shown in the examples above, all `dset` interactions mutate the source object.\n\nIf you need immutable writes, please visit [`clean-set`](https://github.com/fwilkerson/clean-set) (182B).
\nAlternatively, you may pair `dset` with [`klona`](https://github.com/lukeed/klona), a 366B utility to clone your source(s). Here's an example pairing:\n\n```js\nimport { dset } from 'dset';\nimport { klona } from 'klona';\n\nexport function deepset(obj, path, val) {\n let copy = klona(obj);\n dset(copy, path, val);\n return copy;\n}\n```\n\n\n## API\n\n### dset(obj, path, val)\n\nReturns: `void`\n\n#### obj\n\nType: `Object`\n\nThe Object to traverse & mutate with a value.\n\n#### path\n\nType: `String` or `Array`\n\nThe key path that should receive the value. May be in `x.y.z` or `['x', 'y', 'z']` formats.\n\n> **Note:** Please be aware that only the _last_ key actually receives the value!\n\n> **Important:** New Objects are created at each segment if there is not an existing structure.
However, when integers are encounted, Arrays are created instead!\n\n#### value\n\nType: `Any`\n\nThe value that you want to set. Can be of any type!\n\n\n## Benchmarks\n\nFor benchmarks and full results, check out the [`bench`](/bench) directory!\n\n```\n# Node 10.13.0\n\nValidation:\n ✔ set-value\n ✔ lodash/set\n ✔ dset\n\nBenchmark:\n set-value x 1,701,821 ops/sec ±1.81% (93 runs sampled)\n lodash/set x 975,530 ops/sec ±0.96% (91 runs sampled)\n dset x 1,797,922 ops/sec ±0.32% (94 runs sampled)\n```\n\n\n## Related\n\n- [dlv](https://github.com/developit/dlv) - safely read from deep properties in 120 bytes\n- [dequal](https://github.com/lukeed/dequal) - safely check for deep equality in 247 bytes\n- [klona](https://github.com/lukeed/klona) - quickly \"deep clone\" data in 200 to 330 bytes\n- [clean-set](https://github.com/fwilkerson/clean-set) - fast, immutable version of `dset` in 182 bytes\n\n\n## License\n\nMIT © [Luke Edwards](https://lukeed.com)\n","_attachments":{},"homepage":"https://github.com/lukeed/dset#readme","bugs":{"url":"https://github.com/lukeed/dset/issues"},"license":"MIT"}