onetime
Advanced tools
Ensure a function is only called once
Weekly downloads
Changelog
https://github.com/sindresorhus/onetime/compare/v5.1.2...v6.0.0
Readme
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
.
$ npm install onetime
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
Returns a function that only calls fn
once.
Type: Function
Function that should only be called once.
Type: object
Type: boolean
Default: false
Throw an error when called more than once.
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
Type: Function
Function to get call count from.
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Ensure a function is only called once
The npm package onetime receives a total of 32,258,996 weekly downloads. As such, onetime popularity was classified as popular.
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.