emptyFunction (Javascript)

The module exports nothing but an empty function/closure.

install

npm install emptyfunction

Usage

Get the empty closure from the module

var emptyFunction = require('emptyfunction');

Now use the function whenever there is an optional closure within your code.

function example(cb) {
  if (!cb) cb = emptyFunction
  for (var i = 0; i < 1337; i++) cb()
}

isEmptyFunction

Sometimes you might need to verify whether the closure is an empty function.

If you have access to the emptyFunction object you can do a strict comparison.

this.someFunction === emptyFunction

If not, a more hacky solution is to use the name of the function:

this.someFunction.name === 'emptyFunction'

Utilities

A simple function to check whether we're dealing with an actual closure:

function isClosure(cb) {
  return (cb && cb !== emptyFunction) ? true: false
}

A simple function to make assigning closures easier:

function setClosure(cb) {
  return (isClosure(cb)) ? cb : emptyFunction
}

// Usage:
var myClosure = setClosure(cb)

License

MIT