react-use-precision-timer

⏱️ React Use Precision Timer

A versatile precision timer hook for React. Doubles as a stopwatch.

Documentation

Read the official documentation.


👁️ Live Demo

Overview

A React timer hook that calls the provided callback at regular intervals. Can be used as a stopwatch, too.

It's accurate, precise, and includes a rich set of options, functionality, and accessors.

$3

- ⏰ Timeout and timestamp based
- Based on setTimeout() and Unix times, not ticks.
- 🎯 Accurate and precise
- Perfect mean accuracy with no wandering, with sub 10ms callback precision.
- 💪 Doesn't choke under pressure
- Resilient to expensive callbacks and low timer delays.
- 🧰 Versatile
- Can be used as a timer, one-time delay, or stopwatch. Additional options available.
- ⏯️ Pause and resume
- Supports pausing, and tracks cumulative elapsed pause time between resumes.
- 🌞 Accessors for everything
- Includes getters for everything under the sun! Know all the things.

$3

Version 3 of this package features a complete redesign to reduce unnecessary renders, plus the addition of a new convenience hook.
- Internally, timer state is now tracked via React refs and timer options are memoized for you. These changes significantly improved performance.
- The useTimer hook's signature has been changed. The callback is now provided as the second argument, and should be cached using React.useCallback() to optimize render performance. Refer to the Quick Start section below.
- The useMomentaryBool hook was added.

Donate

If this project helped save you time, please consider buying me a coffee, which powers my development (and life). Your support is much appreciated!

Table of Contents

- Documentation
- Overview
- Features include:
- 🆕 New In Version 3
- Donate
- Table of Contents
- Installation
- Quick Start
- Repeating Timer
- One-Time Delay
- Stopwatch
- Momentary Boolean
- Other Usage
- TypeScript
- Icon Attribution
- Contributing
- ⭐ Found It Helpful? Star It!
- License

Installation

``
npm i react-use-precision-timer
`

Quick Start

$3

`jsx
import { useTimer } from "react-use-precision-timer";
`

In your function component:

`jsx
const callback = React.useCallback(() => console.log('Boom'), []);
// The callback will be called every 1000 milliseconds.
const timer = useTimer({ delay: 1000 }, callback);
`

In a handler or effect:

`jsx
timer.start();
`

The following functions can be used to control the Timer:

- timer.start() - Start the timer. If already started, will restart the timer. You can optionally pass a start time in Unix epoch milliseconds.
- timer.stop() - Stop the timer.
- timer.pause() - Pause the timer.
- timer.resume() - Resume the timer.

Refer to Timer for all available functions, including getters for elapsed times.

$3

If you'd like to run a callback after a one-time delay, use the helper hook useDelay:

`jsx
import { useDelay } from 'react-use-precision-timer';
`

In your function component:

`jsx
const callback = React.useCallback(() => console.log('Boom'), []);
// Will call once after 1000ms.
const onceTimer = useDelay(1000, callback);
`

In a handler or effect:

`jsx
onceTimer.start();
`

This will call the callback after the provided 1000 millisecond delay only once.

$3

The timer also functions as a stopwatch when no delay is provided. You can use the helper hook useStopwatch:

`jsx
import { useStopwatch } from "react-use-precision-timer";
`

`jsx
const stopwatch = useStopwatch();
`

Use start(), stop(), pause(), and resume() to control the stopwatch.

Stopwatch is a Timer object. Refer to Timer's getters to retrieve elapsed running time, paused time, and so forth.

Calling start while a stopwatch is already running will restart it.

$3

For convenience, the useMomentaryBool hook has been included to momentarily toggle a boolean. This wraps the useDelay hook.

This is very useful for momentary notifications, such as a copy button that shows a momentary checkmark to indicate the operation succeeded.

`jsx
import { useMomentaryBool } from 'react-use-precision-timer';
`

In your function component:

`jsx
// Toggle to true, then back to false after 1000ms.
const [value, toggle] = useMomentaryBool(false, 1000);
`

Calling toggle() will set the boolean to true, then back to false` after a 1000 millisecond delay.

$3

See useTimer for all other hook options and timer functions.

TypeScript

Type definitions have been included for TypeScript support.

Icon Attribution

Favicon by Twemoji.

Contributing

Open source software is awesome and so are you. 😎

Feel free to submit a pull request for bugs or additions, and make sure to update tests as appropriate. If you find a mistake in the docs, send a PR! Even the smallest changes help.

For major changes, open an issue first to discuss what you'd like to change.

⭐ Found It Helpful? Star It!

If you found this project helpful, let the community know by giving it a star: 👉⭐

Want to support the project? Feel free to grab me a coffee, which is my main source of fuel for development:

License

See LICENSE.md.