https://github.com/pxyup/rxjs-min-max
RxJs Operators for emits minimum/maximum value on each iteration.
https://github.com/pxyup/rxjs-min-max
angular observable rxjs
Last synced: about 1 month ago
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RxJs Operators for emits minimum/maximum value on each iteration.
- Host: GitHub
- URL: https://github.com/pxyup/rxjs-min-max
- Owner: PxyUp
- License: mit
- Created: 2018-09-30T00:22:50.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2018-09-30T11:34:41.000Z (over 7 years ago)
- Last Synced: 2025-07-22T13:57:46.563Z (11 months ago)
- Topics: angular, observable, rxjs
- Language: TypeScript
- Homepage: https://github.com/ReactiveX/rxjs/pull/4208#issuecomment-425711532
- Size: 18.6 KB
- Stars: 2
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# rxjs-min-max
RxJs Operators for emits minimum/maximum value on each iteration.
[](https://nodei.co/npm/rxjs-min-max/)
# Example
```javascript
import { maxStream, minStream } from 'rxjs-min-max'
of(1, 1, 2, 2, 2, 0, 1, 2, 3, -1, 4).pipe(
maxStream(),
)
.subscribe(x => console.log(x)); // 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 4
of(
{ age: 4, name: 'Foo'},
{ age: 7, name: 'Bar'},
{ age: 3, name: 'Foo'},
{ age: 6, name: 'Foo'},
).pipe(
minStream((p: Person, q: Person) => p.age > q.age),
)
.subscribe(x => console.log(x));
// displays:
// { age: 4, name: 'Foo' }
// { age: 4, name: 'Foo' }
// { age: 3, name: 'Foo'},
// { age: 3, name: 'Foo'},
```
# Performance
You can used this operators like min/max:
```javascript
.pipe(
minStream(), // maxStream
last()
) // equal min() / max()
```
If size of stream big(n > 10000), minStream(maxStream) work faster than min(max):
```javascript
var rxjsMinMax = require('./dist/index.js');
var rxjs = require('rxjs');
var last = require('rxjs/operators').last;
var min = require('rxjs/operators').min;
const n = 100000;
const array = Array.from({ length: n }, () => Math.floor(Math.random() * n));
console.time('minStream');
rxjs.from(array).pipe(rxjsMinMax.minStream(), last()).subscribe((x) => console.log(x));
console.timeEnd('minStream');
console.time('min');
rxjs.from(array).pipe(min()).subscribe((x) => console.log(x));
console.timeEnd('min');
// count n = 100000
// 0
// minStream: 11.276ms
// 0
// min: 40.306ms
// count n = 1000000
// 0
// minStream: 24.084ms
// 0
// min: 72.204ms
// count n = 10000000
// 1
// minStream: 137.856ms
// 1
// min: 437.046ms
// count n = 1000
// 0
// minStream: 5.738ms
// 0
// min: 1.779ms
```