xstream
Version:
An extremely intuitive, small, and fast functional reactive stream library for JavaScript
99 lines • 7.28 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var index_1 = require("../index");
var ThrottleOperator = /** @class */ (function () {
function ThrottleOperator(dt, ins) {
this.dt = dt;
this.ins = ins;
this.type = 'throttle';
this.out = null;
this.id = null;
}
ThrottleOperator.prototype._start = function (out) {
this.out = out;
this.ins._add(this);
};
ThrottleOperator.prototype._stop = function () {
this.ins._remove(this);
this.out = null;
this.id = null;
};
ThrottleOperator.prototype.clearInterval = function () {
var id = this.id;
if (id !== null) {
clearInterval(id);
}
this.id = null;
};
ThrottleOperator.prototype._n = function (t) {
var _this = this;
var u = this.out;
if (!u)
return;
if (this.id)
return;
u._n(t);
this.id = setInterval(function () {
_this.clearInterval();
}, this.dt);
};
ThrottleOperator.prototype._e = function (err) {
var u = this.out;
if (!u)
return;
this.clearInterval();
u._e(err);
};
ThrottleOperator.prototype._c = function () {
var u = this.out;
if (!u)
return;
this.clearInterval();
u._c();
};
return ThrottleOperator;
}());
/**
* Emits event and drops subsequent events until a certain amount of silence has passed.
*
* Marble diagram:
*
* ```text
* --1-2-----3--4----5|
* throttle(60)
* --1-------3-------5-|
* ```
*
* Example:
*
* ```js
* import fromDiagram from 'xstream/extra/fromDiagram'
* import throttle from 'xstream/extra/throttle'
*
* const stream = fromDiagram('--1-2-----3--4----5|')
* .compose(throttle(60))
*
* stream.addListener({
* next: i => console.log(i),
* error: err => console.error(err),
* complete: () => console.log('completed')
* })
* ```
*
* ```text
* > 1
* > 3
* > 5
* > completed
* ```
*
* @param {number} period The amount of silence required in milliseconds.
* @return {Stream}
*/
function throttle(period) {
return function throttleOperator(ins) {
return new index_1.Stream(new ThrottleOperator(period, ins));
};
}
exports.default = throttle;
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