streams/sources/interval.js

A lazy streams library for functional composition in JavaScript.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.defaultScheduler = void 0;
exports.iteratorInterval = iteratorInterval;
const event_1 = require("./event");
exports.defaultScheduler = {
    schedule(interval, listener) {
        return setInterval(listener, interval);
    },
    cancel(scheduled) {
        clearInterval(scheduled);
    },
};
function iteratorInterval(periodMillis, scheduler = exports.defaultScheduler) {
    let timer;
    function startTimer(handler) {
        let n = 0;
        timer = scheduler.schedule(periodMillis, () => {
            handler(n++);
        });
    }
    function stopTimer() {
        scheduler.cancel(timer);
    }
    return (0, event_1.fromEventPattern)(startTimer, stopTimer);
}
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