The Split-Second Precise JavaScript Timer

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🧐 About

Goodtimer provides an accurate-to-milliseconds way of implementing setTimeout and setInterval. It's the timer of your dreams, providing a high-level API to easily manipulate countdowns. Here's a few things that make Goodtimer so good:

• It self-corrects delays from the event loop, so it's guaranteed to stay in sync with time.
• It comes with a flexible timeExpression syntax, so you can easily express time in a number of desirable ways.
• Provides drop-in replacement to setInterval.
• Can be used in projects like react with npm, or directly in the browser via cdn;

Installation & simple usage

Download using npm

npm i --save goodtimer

And use in your code!

const { Timer } = require('goodtimer');

new Timer('1:00');

Or replace your drifty setIntervals with setGoodInterval ⭐️:

const { setGoodInterval } = require('goodtimer').timeutil;

setGoodInterval(() => console.log("exactly 1 second!"), 1000);

💝 Browser-compatible client-side version now available!

<script src="https://cdn.nickpal.to/goodtimer/goodtimer-3.3.0.js"></script>
<script>
  new goodtimer.Timer('1:00');
</script>

➡️ Jump into the full docs site here or read below for a few more quick examples 🙇

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⏲ Simple Usage

const yourFn = () => {};
new Timer('1:00', yourFn); // replacement for setTimeout
new Timer('1:00', yourFn, { repeat: true }); // replacement for setInterval

const timer = new Timer('5:00'); // (Five minutes)
timer.pause();         // freezes timer at given time
timer.unpause();       // resumes timer
timer.reset();         // resests to initial value (in this case 5 minutes)
timer.toString()       // returns in UTC-like format ("5:00.000")
// ~ 1 second later ~
timer.fmtTime("%M minutes %s seconds") // -> "4 minutes 59 seconds" (many ways to use!) 
timer.gt('1:00');      // "greater than" -> true
timer.lt('60:00:00');  // "less than (60 hrs)" -> true
timer.equals('6m');    // (6 minutes, alternate notation) -> false

// or use the Time class and skip the controls
const [minute, second] = [new Time('1m'), new Time('1s')];

minute.gt(second)        // -> true
second.equals(':01')     // -> true
minute.equals(second)    // -> false
second.set(minute)       // set to new value
minute.equals(second)    // -> true
minute.toString()        // -> "1:00.000"

// `timeExpressions` are passed to Time or Timer, and can be an
// object, number, array, or string (in multiple formats)
// below are all the ways to write "25 minutes and 500 milliseconds"

new Time('25:00.5'); // string in UTC-like syntax
new Time('25m500ms'); // string with unit annotation
new Time(1500500);  // number for milliseconds
new Time({          // object with full names
    minutes: 25, 
    milliseconds: 500 
});

Ready to jump in? See the full Documentation site spec for many more uses and tutorials!

👏 Supporters

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