Javascript 'arguments' Keyword -



Javascript 'arguments' Keyword -

my understanding can phone call array.prototype.slice.call(arguments, 1) homecoming tail of array.

why won't code homecoming [2,3,4,5]?

function foo() { homecoming array.prototype.slice.call(arguments,1); } alert(foo([1,2,3,4,5]));

because you're passing one argument — array.

try alert(foo(1,2,3,4,5));

arguments numbered 0 in javascript, when start piece @ 1 , pass 1 argument, nothing.

note can hamper optimization allow arguments object "leak" out of function. because of aliasing between arguments , formal parameters, optimizer can't static analysis of function if arguments object gets sent somewhere else, because has no thought might happen parameter variables.

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