sxoinas12 82e781b8aa Graph & Tree | 5 年 前 | |
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LICENSE | 5 年 前 | |
README.md | 5 年 前 | |
package.json | 5 年 前 | |
wrappy.js | 5 年 前 |
Callback wrapping utility
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)