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# dset [](https://github.com/lukeed/dset/actions) [](https://codecov.io/gh/lukeed/dset) > A tiny (197B) utility for safely writing deep Object values~! For _accessing_ deep object properties, please see [`dlv`](https://github.com/developit/dlv). > **Using GraphQL?** You may want `dset/merge` – see [Merging](#merging) for more info. ## Install ```sh $ npm install --save dset ``` ## Modes There are two "versions" of `dset` available: #### `dset` > **Size (gzip):** 197 bytes<br> > **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) ```js import { dset } from 'dset'; ``` #### `dset/merge` > **Size (gzip):** 307 bytes<br> > **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) ```js import { dset } from 'dset/merge'; ``` ## Usage ```js import { dset } from 'dset'; let foo = { abc: 123 }; dset(foo, 'foo.bar', 'hello'); // or: dset(foo, ['foo', 'bar'], 'hello'); console.log(foo); //=> { //=> abc: 123, //=> foo: { bar: 'hello' }, //=> } dset(foo, 'abc.hello', 'world'); // or: dset(foo, ['abc', 'hello'], 'world'); console.log(foo); //=> { //=> abc: { hello: 'world' }, //=> foo: { bar: 'hello' }, //=> } let bar = { a: { x: 7 }, b:[1, 2, 3] }; dset(bar, 'b.1', 999); // or: dset(bar, ['b', 1], 999); // or: dset(bar, ['b', '1'], 999); console.log(bar); //=> { //=> a: { x: 7 }, //=> b: [1, 999, 3], //=> } dset(bar, 'a.y.0', 8); // or: dset(bar, ['a', 'y', 0], 8); // or: dset(bar, ['a', 'y', '0'], 8); console.log(bar); //=> { //=> a: { //=> x: 7, //=> y: [8], //=> }, //=> b: [1, 999, 3], //=> } let baz = {}; dset(baz, 'a.0.b.0', 1); dset(baz, 'a.0.b.1', 2); console.log(baz); //=> { //=> a: [{ b: [1, 2] }] //=> } ``` ## Merging The 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~! Below is a quick illustration of the difference between `dset` and `dset/merge`: ```js let input = { hello: { abc: 123 } }; dset(input, 'hello', { world: 123 }); console.log(input); // via `dset` //=> { //=> hello: { //=> world: 123 //=> } //=> } // via `dset/merge` //=> { //=> hello: { //=> abc: 123, //=> world: 123 //=> } //=> } ``` ## Immutability As shown in the examples above, all `dset` interactions mutate the source object. If you need immutable writes, please visit [`clean-set`](https://github.com/fwilkerson/clean-set) (182B).<br> Alternatively, you may pair `dset` with [`klona`](https://github.com/lukeed/klona), a 366B utility to clone your source(s). Here's an example pairing: ```js import { dset } from 'dset'; import { klona } from 'klona'; export function deepset(obj, path, val) { let copy = klona(obj); dset(copy, path, val); return copy; } ``` ## API ### dset(obj, path, val) Returns: `void` #### obj Type: `Object` The Object to traverse & mutate with a value. #### path Type: `String` or `Array` The key path that should receive the value. May be in `x.y.z` or `['x', 'y', 'z']` formats. > **Note:** Please be aware that only the _last_ key actually receives the value! > **Important:** New Objects are created at each segment if there is not an existing structure.<br>However, when integers are encounted, Arrays are created instead! #### value Type: `Any` The value that you want to set. Can be of any type! ## Benchmarks For benchmarks and full results, check out the [`bench`](/bench) directory! ``` # Node 10.13.0 Validation: ✔ set-value ✔ lodash/set ✔ dset Benchmark: set-value x 1,701,821 ops/sec ±1.81% (93 runs sampled) lodash/set x 975,530 ops/sec ±0.96% (91 runs sampled) dset x 1,797,922 ops/sec ±0.32% (94 runs sampled) ``` ## Related - [dlv](https://github.com/developit/dlv) - safely read from deep properties in 120 bytes - [dequal](https://github.com/lukeed/dequal) - safely check for deep equality in 247 bytes - [klona](https://github.com/lukeed/klona) - quickly "deep clone" data in 200 to 330 bytes - [clean-set](https://github.com/fwilkerson/clean-set) - fast, immutable version of `dset` in 182 bytes ## License MIT © [Luke Edwards](https://lukeed.com)