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Difference between . and : in Lua
...s exactly the same as specifying self manually - it will even produce same bytecode on compilation. I.e. function object:method(arg1, arg2) is same as function object.method(object, arg1, arg2).
On use : is almost the same as . - a special kind of call will be used internally to make sure object an...
How do I create a class instance from a string name in ruby?
...
In rails you can just do:
clazz = 'ExampleClass'.constantize
In pure ruby:
clazz = Object.const_get('ExampleClass')
with modules:
module Foo
class Bar
end
end
you would use
> clazz = 'Foo::Bar'.split('::').inject(Object) {|o,c| o.const_get c}
=> Foo::Bar
> clazz.new
=>...
how do I insert a column at a specific column index in pandas?
... imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454...
HTML5 textarea placeholder not appearing
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I know this post has been (very well) answered by Aquarelle but just in case somebody is having this issue with other tag forms with no text such as inputs i'll leave this here:
If you have an input in your form and placeholder is not showing because a white space at th...
Web Reference vs. Service Reference
...feeaddict: well, I think MS is trying to subtly sway you towards using WCF by default - and only old-style ASMX if you're really determined :-)
– marc_s
Jan 29 '10 at 16:34
27
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Why should I not wrap every block in “try”-“catch”?
... Kendall: If an exception gets to a top-level handler, your application is by definition in an undefined state. Although in some specific cases there might be value to preserving the user's data (Word's document recovery comes to mind) the program shouldn't overwrite any files or commit to a databas...
What is scope/named_scope in rails?
I've recently started an internship. My employer uses ruby on rails, and I frequently encounter new syntax that I need to look up to understand. I've googled around for a good explanation of named_scope, but what I've found so far is mostly blog posts giving high praise for it, rather a straight def...
Is there any way to create a blank solution (.sln) file first and then add projects?
..., you
can add new or existing projects and
items to the empty solution by using
the Add New Item or Add Existing Item
command from the Project menu.
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How can I catch a ctrl-c event?
...C, not C++. In C++ you should use <cstdlib>
– Abyx
Sep 19 '10 at 11:59
8
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Difference between Service, Async Task & Thread?
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Also notable is that by default Android services run on the main (UI) thread. If your service needs to do work in the background, it needs to be launched in a separate thread (or AsyncTask) explicitly. Otherwise it can risk interrupting the UI ...