shift

I'm frequently using shift to unpack function parameters: sub my_sub { my $self = shift; my $params = shift; .... } However, many on my colleagues are preaching that shift is actually evil. Could you explain why I should prefer sub my_sub { my ($self, $params) = @_; .... } to shift ? The use of shift to unpack arguments is not evil. It's a common convention and may be the fastest way to process arguments (depending on how many there are and how they're passed). Here's one example of a somewhat common scenario where that's the case: a simple accessor. use Benchmark qw(cmpthese); sub Foo::x

I have written a JS function that only allow numbers to be entered. A copy of that function is below: function NumbersOnly(e) { var evt = e || window.event; if (evt) { var keyCode = evt.charCode || evt.keyCode; //Allow tab, backspace and numbers to be pressed, otherwise return false for everything. //(keyCode>=96 && keyCode<=105) are the numpad numbers if ((keyCode >= 48 && keyCode <= 57) || (keyCode >= 96 && keyCode <= 105) || keyCode === 9 || keyCode === 8) { } else { evt.returnValue = false; } } } This function works fine with all the numbers but my problem happens when the shift key is

This question already has an answer here: Is Chrome's JavaScript console lazy about evaluating arrays? 7 answers Can someone explain the following two outputs? Code 1: console.log(itemsAry); //loadNextItem(); function loadNextItem(){ var item = itemsAry.shift(); console.log(item); } Result: ["cat-53", "cat-57", "cat-51", "cat-10", "cat-55", "cat-56", "cat-5", "cat-50", "cat-3", "cat-54", "cat-52", "cat-9", "cat-8", "cat-4", "cat-58", "cat-6", "cat-7"] (as expected). Code 2: console.log(itemsAry); loadNextItem(); function loadNextItem(){ var item = itemsAry.shift(); console.log(item); } Result:

I've been wondering if I can detect CTRL and SHIFT key being pressed WITHOUT using keydown event. The reason is that I am creating some sort of Grid Viewer in JavaScript, and I implemented selecting different items by holding CTRL or SHIFT key as it functions in most common viewers, editors and so on. The problem is that when the focus is not anywhere on the page. For example I'm adding page to the bookmarks. Then I hold CTRL or SHIFT and click on the item, but it acts normally as keydown hasn't been triggered. Any way of omitting this? Perhaps not, but it can be confusing for customers who

I want to create a 64-bit barrel shifter in verilog (rotate right for now). I want to know if there is a way to do it without writing a 65 part case statement? Is there a way to write some simple code such as: Y = {S[i - 1:0], S[63:i]}; I tried the code above in Xilinx and get an error: i is not a constant. Main Question: Is there a way to do this without a huge case statment? I've simplified some of the rules for clarity, but here are the details. In the statement Y = {S[i - 1:0], S[63:i]}; you have a concatenation of two signals, each with a constant part select. A constant part select is of