wrappy

wrappy

Callback wrapping utility

USAGE

var wrappy = require("wrappy")

// var wrapper = wrappy(wrapperFunction)

// make sure a cb is called only once
// See also: http://npm.im/once for this specific use case
var once = wrappy(function (cb) {
  var called = false
  return function () {
    if (called) return
    called = true
    return cb.apply(this, arguments)
  }
})

function printBoo () {
  console.log('boo')
}
// has some rando property
printBoo.iAmBooPrinter = true

var onlyPrintOnce = once(printBoo)

onlyPrintOnce() // prints 'boo'
onlyPrintOnce() // does nothing

// random property is retained!
assert.equal(onlyPrintOnce.iAmBooPrinter, true)

Similar packages

Other packages similar to wrappy

once

The 'once' package is similar to wrappy in that it ensures a function can only be called once. It is more specialized than wrappy, as it is specifically designed for the purpose of creating functions that can only be called one time, whereas wrappy is a more general-purpose wrapper.

lodash.once

Provided by the popular Lodash utility library, 'lodash.once' is a function that ensures a given function can only be called once. Like 'once', it is more specialized compared to wrappy, and it comes with the additional overhead of the Lodash library if you are not already using it in your project.