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What is the difference between require() and library()?
...less you actually will be using the value it returns e.g in some error checking loop such as given by thierry.
In most other cases it is better to use library(), because this will give an error message at package loading time if the package is not available. require() will just fail without an erro...
Can I invoke an instance method on a Ruby module without including it?
...s.foo(self)"
end
end
The module_function approach below will avoid breaking any classes which include all of Mods.
module Mods
def foo
puts "Mods.foo"
end
end
class Includer
include Mods
end
Includer.new.foo
Mods.module_eval do
module_function(:foo)
public :foo
end
Includer.ne...
How to replace multiple white spaces with one white space
... edited Feb 2 '12 at 23:41
Frank van Puffelen
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answered Aug 14 '09 at 19:57
...
What is the difference between visibility:hidden and display:none?
...located for it between the other tags.
visibility:hidden means that unlike display:none, the tag is not visible, but space is allocated for it on the page. The tag is rendered, it just isn't seen on the page.
For example:
test | <span style="[style-tag-value]">Appropriate style in this ta...
Can you use a trailing comma in a JSON object?
...t or array. For example, code to output from an array of strings might look like (in a C++ like pseudocode):
19 Answers
...
Which SQL query is faster? Filter on Join criteria or Where clause?
...ause it reduces the result set at the soonest possible moment, but I don't know for sure.
9 Answers
...
MySQL: How to copy rows, but change a few fields?
I have a large number of rows that I would like to copy, but I need to change one field.
6 Answers
...
How do you set the Content-Type header for an HttpClient request?
...y this is failing. AddWithoutValidation as suggested by Robert Levy may work, but you can also set the content type when creating the request content itself (note that the code snippet adds application/json in two places-for Accept and Content-Type headers):
HttpClient client = new HttpClient();
cli...
htmlentities() vs. htmlspecialchars()
... encoded. The choices are everything (entities) or "special" characters, like ampersand, double and single quotes, less than, and greater than (specialchars).
I prefer to use htmlspecialchars whenever possible.
For example:
echo htmlentities('<Il était une fois un être>.');
// ...
favicon.png vs favicon.ico - why should I use PNG instead of ICO?
...
Answer replaced (and turned Community Wiki) due to numerous updates and notes from various others in this thread:
ICOs and PNGs both allow full alpha channel based transparency
ICO allows for backwards compatibility to older browsers (e.g. IE6)
PNG probably has b...