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  • License MIT

Throttle promise-returning & async functions

Package Exports

  • p-throttle

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (p-throttle) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

p-throttle Build Status

Throttle promise-returning & async functions

It also works with normal functions.

Useful for rate limiting calls to an external API, for example.

Install

$ npm install p-throttle

Usage

Here, the trottled function is only called twice a second:

const pThrottle = require('p-throttle');

const now = Date.now();

const throttled = pThrottle(index => {
    const secDiff = ((Date.now() - now) / 1000).toFixed();
    return Promise.resolve(`${index}: ${secDiff}s`);
}, 2, 1000);

for (let i = 1; i <= 6; i++) {
    throttled(i).then(console.log);
}
//=> 1: 0s
//=> 2: 0s
//=> 3: 1s
//=> 4: 1s
//=> 5: 2s
//=> 6: 2s

API

pThrottle(fn, limit, interval)

Returns a throttled version of fn.

fn

Type: Function

Promise-returning/async function or a normal function.

limit

Type: number

Maximum number of calls within an interval.

interval

Type: number

Timespan for limit in milliseconds.

throttledFn.abort()

Abort pending executions. All unresolved promises are rejected with a pThrottle.AbortError error.

  • p-debounce - Debounce promise-returning & async functions
  • p-limit - Run multiple promise-returning & async functions with limited concurrency
  • p-memoize - Memoize promise-returning & async functions
  • More…

License

MIT © Sindre Sorhus