https://github.com/isaacs/wrappy

Callback wrapping utility
https://github.com/isaacs/wrappy

npm-cli

Last synced: over 1 year ago
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Callback wrapping utility

• Host: GitHub
• URL: https://github.com/isaacs/wrappy
• Owner: isaacs
• License: isc
• Created: 2014-09-18T23:01:16.000Z (almost 12 years ago)
• Default Branch: main
• Last Pushed: 2024-02-10T05:58:21.000Z (over 2 years ago)
• Last Synced: 2025-03-10T05:09:51.373Z (over 1 year ago)
• Topics: npm-cli
• Language: JavaScript
• Homepage:
• Size: 19.5 KB
• Stars: 55
• Watchers: 28
• Forks: 27
• Open Issues: 6
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# wrappy

Callback wrapping utility

## USAGE

```javascript

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)

```