javascript - What does RxJS.Observable debounce do? -


can explain in plain english rxjs observavle debounce function does?

i imagine emits event once in while depending on parameters, code below doesn't work expected.

var x$ = rx.observable.fromevent(window, 'click') .map(function(e) {return {x:e.x, y:e.y};}) .debounce(1000) .subscribe(function(el) {   console.log(el); });

and the jsbin version.

i expected code print 1 click once per second, no matter how fast clicking. instead prints click @ think random intervals.

debounce emit value after specified time interval has passed without value being emitted.

using simple diagrams following may provide greater help:

stream 1 | ---1-------2-3-4-5---------6----      after debounce, emitted stream looks follows:  stream 2 | ------1-------------5---------6-

the intermediate items (in case, 2,3,4) ignored.

an example illustrated below:

var rx = require('rx-node'); var source = rx.fromstream(process.stdin).debounce(500); var subscription = source.subscribe(     function (x) {         console.log('next: %s', x);     } );

i used node illustrate this... assuming have node installed, can run typing 

$node myfile.js  (where aforementioned code in myfile.js)

once node program started can type values @ console -- if type items ignored, , if type intermittently fast , slow items appear after gap in typing (in example above have 500ms) @ console ("next: ")

there excellent reference material @ https://github.com/reactive-extensions/rxjs/blob/master/doc/api/core/operators/debounce.md


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