invoke-once

Restrict the given function only be invoked once. Repeat calls to the function return the value of the first invocation.

Install

$ npm install --save invoke-once

For more use-cases see the tests

var invokeOnce = require('invoke-once');

var c  = 0;
var fn = invokeOnce(function () {
  return ++c;
});

fn(); // => 1
fn(); // => 1
fn(); // => 1

invoke-fn - A faster alternative to Function#apply.
invoke-before - Returns a function that will only be executed before being called N times.
invoke-after - Returns a function that will only be executed after being called N times.
try-invoke - Attempts to invoke the given function, returning either the result or the caught error object.
is-native - Checks if the given value is a native function.
to-source-code - Converts function to its source code.

Pull requests and stars are highly welcome.

For bugs and feature requests, please create an issue.