iced-error

An error-handling class written with/for IcedCoffeeScript

npm install iced-error
6 downloads in the last day
91 downloads in the last week
379 downloads in the last month

IcedErrors

An integrated error system for dealing with errors, written for and with IcedCoffeeScript. I found myself doing this stuff everytime I wrote a new project, so better to standardize it.

Enumerated Error Types

In your lib/error.iced file:


{make_errors} = require 'iced-error'
exports.E = make_errors
  NOT_FOUND : "Requested resource was not found"
  BAD_MAC : "MAC failed on header"
  INVAL : "Invalid value"
  DB_INSERT : "Error inserting into the database"

In your foo.iced file:

{E} = require './lib/error'

console.log E.OK                # prints 0
console.log E.NOT_FOUND         # prints 100
console.log E.msg[E.NOT_FOUND]  # prints "Requested resource was not found"
console.log E.msg.NOT_FOUND]    # prints "Requested resource was not found"
console.log E.name.NOT_FOUND    # prints "NOT_FOUND"
console.log E.name[E.NOT_FOUND] # prints "NOT_FOUND"

You can also use predefined Error classes:

{E} = require './lib/error'

# You can throw these errors too
throw new E.NotFoundError("your file") 

# Will print [NotFoundError: your file (code 100)]
console.log new E.NotFoundError "your file"

# Will print "your file"
console.log (new E.NotFoundError "your file").message

# Will print 100
console.log (new E.NotFoundError "your file").code

Error Short Circuiters

Catch errors all at once, not everywhere!

{make_esc} = require 'iced-error'
my_fn = (cb) ->
  esc = make_esc gcb, "my_fn"
  await socket.get 'image id', esc defer id
  await Image.findById id, esc defer image
  await check_permissions user, image, esc defer permitted
  gcb null, image
npm loves you