Use Array.slice() method for slicing arguments inside Events.trigger()

[pankaj28843]

[].slice.call(arguments, 1) can be used for slicing an Array like object instead of a for loop. This question posted on Stackoverflow suggests that slice is faster than for loop.

[braddunbar]

Mornin @psjinx, thanks for your patch!

a.slice() is in fact faster than a loop when copying the entire array. However, we are leaving out the first element in this case, and a.slice(1) is much slower than using a loop. If you're interested in the details, #1284 includes a discussion and appropriate benchmarks.

[pankaj28843]

@braddunbar thanks for quick reply!

I am new to backbone.js and was trying to learn internals by reading source code. I think reason for using for loop should be there (before for loop) in a comment as discussed in #1284

[braddunbar]

Fantastic! That's the best way to learn it.

I've added a comment in #1512. Please let us know if you find any other confusing points or inconsistencies. :)