callback slice args

gistfile1.js

function callbackSliceArgs(callback, howMany) {
    return function() {
        var args = _.toArray(arguments);
        args.splice(howMany, args.length);
        return callback.apply(null, args);
    };
}

use it when you only need to get passed the first X arguments to the callback, useful when using array/collection transformation methods

function foo(a, b) {
   console.log(a,b);
}

var pfoo = _.partialRight(foo, 'b');
_.forEach([1, 2, 3, 4], callbackSliceArgs(pfoo, 1) );

will print out:

1, 'b'
2, 'b'
3, 'b'
4, 'b'