RateLimitFn

this package allows to limit the speed with which a function is called.

Installation

npm install ratelimit-fn

Usage

function rate(fn, perSec)

Params:

• fn: the function to rate
• perSec: the number of allowed executions per second

Example (Js)

const rate = require('ratelimitfn').rate;

const myLimitedFn = rate(console.log, 1);

// this will fire console.log one time per second
myLimitedFn('Hello world!');
myLimitedFn('Hello world!');
myLimitedFn('Hello world!');

Example (Ts)

import { rate } from 'ratelimitfn';

const myLimitedFn = rate(console.log, 1);

// this will fire console.log one time per second
myLimitedFn('Hello world!');
myLimitedFn('Hello world!');
myLimitedFn('Hello world!');

Use with promises or callbacks

Rated functions will return promises, so you can wait them to finish. Example:

import { rate } from 'ratelimitfn';

const myLimitedFn = rate(console.log, 1);

// this will fire console.log one time per second
await myLimitedFn('Hello world!');
console.log('This will be executed after the previous line');

If your rated function receives a callback, you can use it as you would do without the package. Exmaple:

import { rate } from 'ratelimitfn';

function myFn(message, cb) {
  console.log('message');
  cb();
}

const myLimitedFn = rate(myFn.log, 1);

// this will fire console.log one time per second
myLimitedFn('Hello world!', () => {
    console.log('This will be executed when the rate limit allows it');
});