promise-not-if-busy v1.0.0

promise-not-if-busy

Wrap a function so if called multiple times, only one call runs simultaneously.

Installation

npm install promise-not-if-busy

Usage

const notIfBusy = require('promise-not-if-busy')

const wrapped = notIfBusy(longOperation)

wrapped() // will call `longOperation` and resolve to the call's results

wrapped() // will not call `longOperation` as it will take long to finish but will resolve to previous call results instead

// after `longOperation` ends...

wrapped() // will call `longOperation` again and resolve to this call's results

API

notIfBusy(fn)

Creates a function that when called multiple times will call ´fn´ and wait for it to finish before calling it again.

Params

fn: Function that returns a promise.

Returns

A function that wraps fn up. It will return a promise that will resolve to the result of calling fn. While fn is busy, it will resolve to the pending promise.

License

MIT