History

silverwind d9b8758f47 tools: update ESLint to 2.7.0 PR-URL: https://github.com/nodejs/node/pull/6132 Reviewed-By: Brian White <mscdex@mscdex.net> Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: thefourtheye <thechargingvolcano@gmail.com>		2016-04-20 16:24:21 -07:00
..
LICENSE	tools: update eslint to v1.10.3	2016-01-14 22:20:14 +11:00
package.json	tools: update ESLint to 2.7.0	2016-04-20 16:24:21 -07:00
README.md	tools: update eslint to v1.10.3	2016-01-14 22:20:14 +11:00
wrappy.js	tools: update eslint to v1.10.3	2016-01-14 22:20:14 +11:00

README.md

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)