Snips arguments off of callback functions.

Usage no npm install needed!

<script type="module">
  import argsnip from '';



Snips arguments off of callback functions, for simpler code and cleaner APIs.


In your project folder, type:

npm install argsnip


Whenever you have code that looks like this, just to trim off unnecessary arguments from your callback:

db.query(query, function(err, result, code, meta) {
    callback(err, result);

Just snip the args!

var argSnip = require('argsnip');
db.query(query, argSnip(2, callback));

But what if you want just the 'err' and 'code' arguments?

db.query(query, argSnip([0, 2], callback));

How about the same two, in reverse order?

db.query(query, argSnip([2, 0], callback));

What if we want all arguments except the first one?

db.query(query, argSnip(1, null, callback));

What if we want to skip the first one, then take the next two arguments?

db.query(query, argSnip(1, 2, callback));
// OR:
db.query(query, argSnip([1, 2], callback));


ArgSnip will save you from using countless wrapper functions to sanitize your callback arguments by letting you send just a slice or cheery-pick of the original arguments to the specified function. Here's what it looks like:

attempt([start], args, callback)

  • start: An optional index at which to start grabbing arguments. If omitted, it's 0.

  • args: The number of arguments from the 'start' index that should be sent to the callback, OR an array specifying the index of each arguments to be sent to the callback, in the order they should be arranged in. Null to take all arguments after the start index.

  • callback: The function to call with reduced arguments.


Attempt is distributed under the MIT license.


ArgSnip was created by Tom Frost in 2012.