error-first-handler



> handles error first callbacks

``bash
npm i -S error-first-handler
`
`js
var fs = require('fs')
var efh = require('error-first-handler')

var default = efh()
fs.readFile('./package.json', default(function (data) {
// If an error occured it is thrown
// Otherwhise the error is shaved off the arguments array
}))

var custom = efh(function (err) {
console.log(err)
})
fs.readFile('./package.json', custom(function (data) {
// If an error occured it is logged
// Otherwhise the error is shaved off the arguments array
}))

var custom2 = efh(function (err) {
console.log(err)
return true
})
fs.readFile('./package.json', custom2(function (data) {
// If an error occured it is logged
// As the handler returns a truthy value the callback is executed
}))

// Passing errors to a parent callback is easy
function readFile(cb) {
fs.readFile('./package.json', efh(cb)(function {
// If an error occured it is handled by the parent callback
// Otherwhise the error is shaved off the arguments array
}))
}
``

MIT License
2015 Stephan Bönnemann