one

onetime

Ensure a function is only called once

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31.3M

GitHub Stars

132

Maintenance

Last Commit

5mos ago

Contributors

8

Package

Dependencies

1

Size (min+gzip)

0.8KB

License

MIT

Type Definitions

Tree-Shakeable

No?

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Readme

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.

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