RXJS:如何以随机间隔(在指定范围内)生成数字流? [英] RXJS: How can I generate a stream of numbers at random intervals (within a specified range)?
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问题描述
我想使用RXJS来设置一个ORDERED数据流,该数据流以随机间隔(比如每1-5秒)发出一个数字,我想用它作为时间随机数据源来测试RXJS的其他部分。以下代码以随机顺序生成项目(由于延迟)但我希望订单仅保留随机化的时间。
I want to use RXJS to set up an ORDERED data stream that emits a number at a random interval (say every 1-5 seconds) which I want to use as a time-randomized data source for testing other parts of RXJS. The following code is generating the items in a random order (due to the delay) but I would like the order preserved only the time randomized.
function randomDelay(bottom, top) {
return Math.floor( Math.random() * ( 1 + top - bottom ) ) + bottom;
}
var source = Rx.Observable
.range(1, 10)
.flatMap(function (x) {
return Rx.Observable
.of(x)
.delay(randomDelay(1000,5000));
})
.timeInterval();
var subscription = source.subscribe(
function (x) {
$("#result").append('Next: ' + JSON.stringify(x) + '<br>');
},
function (err) {
$("#result").append('Error: ' + err);
},
function () {
$("#result").append('Completed');
});
给出了以下输出的变体:
is giving me variants of the following output:
Next: {"value":1,"interval":1229}
Next: {"value":2,"interval":321}
Next: {"value":4,"interval":645}
Next: {"value":5,"interval":28}
Next: {"value":9,"interval":728}
Next: {"value":10,"interval":269}
Next: {"value":3,"interval":107}
Next: {"value":6,"interval":265}
Next: {"value":8,"interval":1038}
Next: {"value":7,"interval":199}
推荐答案
使用 concatMap
而不是 flatMap
。
此处的文档:
https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/operators/concatmap.md
var source = Rx.Observable
.range(1, 10)
.concatMap(function (x) {
return Rx.Observable
.of(x)
.delay(randomDelay(1000,5000));
})
.timeInterval();
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