Question

Possible Duplicate:
[].slice or Array.prototype.slice

the first

(function() {
    var slice = Array.prototype.slice,
        aArguments = slice.apply(arguments);
})(10, 20, 30);

the second

(function() {
    var aArguments = [].slice.apply(arguments);
})(10, 20, 30);

what’s the difference?

only ​​Speed？

Answer 1

Just different means of getting the same .slice() method. Methods on Array.prototype are available from all Array objects.

• The first one requires more object property lookups.

• The second one requires the creation of a new Array

Performance considerations will likely vary between implementations, and are likely minor.

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Note that you can also do this if you want all the arguments…

var aArguments = Array.apply(null, arguments);