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once

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once

Run a function exactly one time

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What is once?

The 'once' npm package is a utility that allows you to ensure a function can only be called once. It is useful for preventing duplicate initialization, handling setup tasks that should only run a single time, or ensuring a callback is only executed once in response to an event or the resolution of a Promise.

What are once's main functionalities?

Ensuring a function is only called once

This feature is used to wrap a function so that it can only be executed once. Subsequent calls to the function will have no effect, and the original return value will be returned.

const once = require('once');
const myFunction = once(() => {
  console.log('This will only be logged once.');
});

myFunction(); // logs 'This will only be logged once.'
myFunction(); // does nothing

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Package last updated on 06 Sep 2016

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