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Call the supplied function exactly one time. This prevents double callback
execution. This module can be used on both node and browsers using browserify.
No magical ES5/6 methods used unlike the once
module does.
npm install one-time
Simply supply the function with the function that should only be called one time:
var one = require('one-time');
function load(file, fn) {
fn = one(fn);
eventemitter.once('load', fn);
eventemitter.once('error', fn);
// do stuff
eventemitter.emit('error', new Error('Failed to load, but still finished'));
eventemitter.emit('load');
}
function example(fn) {
fn = one(fn);
fn();
fn('also receives all arguments');
fn('it returns the same value') === 'bar';
fn('never');
fn('gonna');
fn('give');
fn('you');
fn('up');
}
example(function () {
return 'bar'
});
once
?The main reason is that once
cannot be used in a browser environment unless it's
ES5 compatible. For a module as simple as this I find that unacceptable. In addition
to that it super heavy on the dependency side. So it's totally not suitable to be
used in client side applications.
In addition to that we make sure that your code stays easy to debug as returned functions are named in the same way as your supplied functions. Making heap inspection and stacktraces easier to understand.
MIT
FAQs
Run the supplied function exactly one time (once)
The npm package one-time receives a total of 7,670,278 weekly downloads. As such, one-time popularity was classified as popular.
We found that one-time demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
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