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onetime

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onetime

Ensure a function is only called once

    6.0.0latest

Version published
Maintainers
1
Weekly downloads
35,425,538
decreased by-11.24%

Weekly downloads

Changelog

Source

Breaking

  • Require Node.js 12 aedfbdb
  • This package is now pure ESM. Please read this.

https://github.com/sindresorhus/onetime/compare/v5.1.2...v6.0.0

Readme

Source

onetime

Ensure a function is only called once

When called multiple times it will return the return value from the first call.

Unlike the module once, this one isn't naughty and extending Function.prototype.

Install

$ npm install onetime

Usage

import onetime from 'onetime'; let index = 0; const foo = onetime(() => ++index); foo(); //=> 1 foo(); //=> 1 foo(); //=> 1 onetime.callCount(foo); //=> 3 import onetime from 'onetime'; const foo = onetime(() => {}, {throw: true}); foo(); foo(); //=> Error: Function `foo` can only be called once

API

onetime(fn, options?)

Returns a function that only calls fn once.

fn

Type: Function

Function that should only be called once.

options

Type: object

throw

Type: boolean
Default: false

Throw an error when called more than once.

onetime.callCount(fn)

Returns a number representing how many times fn has been called.

Note: It throws an error if you pass in a function that is not wrapped by onetime.

import onetime from 'onetime'; const foo = onetime(() => {}); foo(); foo(); foo(); console.log(onetime.callCount(foo)); //=> 3
fn

Type: Function

Function to get call count from.

onetime for enterprise

Available as part of the Tidelift Subscription.

The maintainers of onetime and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. Learn more.

Keywords

FAQs

What is onetime?

Ensure a function is only called once

Is onetime popular?

The npm package onetime receives a total of 27,299,188 weekly downloads. As such, onetime popularity was classified as popular.

Is onetime well maintained?

We found that onetime demonstrated a not healthy version release cadence and project activity because the last version was released a year ago.It has 1 open source maintainer collaborating on the project.

Last updated on 08 Apr 2021

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