144 lines
2.9 KiB
Plaintext
144 lines
2.9 KiB
Plaintext
# flattie [](https://github.com/lukeed/flattie/actions) [](https://codecov.io/gh/lukeed/flattie)
|
||
|
||
> A tiny (203B) and [fast](#benchmarks) utility to flatten an object with customizable glue
|
||
|
||
This module recursively squashes an Object/Array. The output is a flat object – AKA, it has a single level of depth.
|
||
|
||
By default, the `.` character is used to glue/join layers' keys together. This is customizable.
|
||
|
||
Finally, by default, any keys with nullish values (`null` and `undefined`) are **not** included in the return object.
|
||
|
||
## Install
|
||
|
||
```
|
||
$ npm install --save flattie
|
||
```
|
||
|
||
|
||
## Usage
|
||
|
||
```js
|
||
import { flattie } from 'flattie';
|
||
|
||
flattie({
|
||
a: 'hi',
|
||
b: {
|
||
a: null,
|
||
b: ['foo', '', null, 'bar'],
|
||
d: 'hello',
|
||
e: {
|
||
a: 'yo',
|
||
b: undefined,
|
||
c: 'sup',
|
||
d: 0,
|
||
f: [
|
||
{ foo: 123, bar: 123 },
|
||
{ foo: 465, bar: 456 },
|
||
]
|
||
}
|
||
},
|
||
c: 'world'
|
||
});
|
||
// {
|
||
// 'a': 'hi',
|
||
// 'b.b.0': 'foo',
|
||
// 'b.b.1': '',
|
||
// 'b.b.3': 'bar',
|
||
// 'b.d': 'hello',
|
||
// 'b.e.a': 'yo',
|
||
// 'b.e.c': 'sup',
|
||
// 'b.e.d': 0,
|
||
// 'b.e.f.0.foo': 123,
|
||
// 'b.e.f.0.bar': 123,
|
||
// 'b.e.f.1.foo': 465,
|
||
// 'b.e.f.1.bar': 456,
|
||
// 'c': 'world'
|
||
// }
|
||
```
|
||
|
||
> **Note:** `null` and `undefined` values are purged by default.
|
||
|
||
## API
|
||
|
||
### flattie(input, glue?, keepNullish?)
|
||
Returns: `Object`
|
||
|
||
Returns a new object with a single level of depth.
|
||
|
||
> **Important:** An object is always returned despite `input` type.
|
||
|
||
#### input
|
||
Type: `Object|Array`
|
||
|
||
The object to flatten.
|
||
|
||
#### glue
|
||
Type: `String`<br>
|
||
Default: `.`
|
||
|
||
A string used to join parent key names to nested child key names.
|
||
|
||
```js
|
||
const foo = { bar: 123 };
|
||
|
||
flattie({ foo }); //=> { 'foo.bar': 123 }
|
||
flattie({ foo }, '???'); //=> { 'foo???bar': 123 }
|
||
```
|
||
|
||
#### keepNullish
|
||
Type: `Boolean`<br>
|
||
Default: `false`
|
||
|
||
Whether or not `null` and `undefined` values should be kept.
|
||
|
||
```js
|
||
// Note: Applies to Objects too
|
||
const foo = ['hello', null, NaN, undefined, /*hole*/, 'world'];
|
||
|
||
flattie({ foo });
|
||
//=> {
|
||
//=> 'foo.0': 'hello',
|
||
//=> 'foo.2': NaN,
|
||
//=> 'foo.5': 'world'
|
||
//=> }
|
||
|
||
flattie({ foo }, '.', true);
|
||
//=> {
|
||
//=> 'foo.0': 'hello',
|
||
//=> 'foo.1': null,
|
||
//=> 'foo.2': NaN,
|
||
//=> 'foo.3': undefined,
|
||
//=> 'foo.4': undefined,
|
||
//=> 'foo.5': 'world'
|
||
//=> }
|
||
```
|
||
|
||
## Benchmarks
|
||
|
||
> Running on Node.js v10.13.0
|
||
|
||
```
|
||
Load Time:
|
||
flat 1.047ms
|
||
flatten-object 1.239ms
|
||
flat-obj 0.997ms
|
||
flattie 0.258ms
|
||
|
||
Validation:
|
||
✔ flat
|
||
✔ flatten-object
|
||
✔ flat-obj
|
||
✔ flattie
|
||
|
||
Benchmark:
|
||
flat x 186,487 ops/sec ±1.28% (86 runs sampled)
|
||
flatten-object x 199,476 ops/sec ±1.01% (93 runs sampled)
|
||
flat-obj x 393,574 ops/sec ±1.41% (95 runs sampled)
|
||
flattie x 909,734 ops/sec ±0.82% (93 runs sampled)
|
||
```
|
||
|
||
|
||
## License
|
||
|
||
MIT © [Luke Edwards](https://lukeed.com)
|