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How to unset a JavaScript variable?
...123 };
var foo = new Foo();
// foo.bar is 123
foo.bar = 456;
// foo.bar is now 456
delete foo.bar;
// foo.bar is 123 again.
So be careful.
EDIT: My answer is somewhat inaccurate (see "Misconceptions" at the end). The link explains all the gory details, but the summary is that there can be big dif...
How to hash some string with sha256 in Java?
... Note that the result of the hash would also be arbitrary binary data, and if you want to represent that in a string, you should use base64 or hex... don't try to use the String(byte[], String) constructor.
e.g.
MessageDigest digest = MessageDigest.getInstance("SHA-256");
byte[] hash = digest.dige...
How to manually expand a special variable (ex: ~ tilde) in bash
...ion
Original answer for historic purposes (but please don't use this)
If I'm not mistaken, "~" will not be expanded by a bash script in that manner because it is treated as a literal string "~". You can force expansion via eval like this.
#!/bin/bash
homedir=~
eval homedir=$homedir
echo $home...
rails + MySQL on OSX: Library not loaded: libmysqlclient.18.dylib
.../libmysqlclient.18.dylib: Operation not permitted" - Everything is working now and I can finally start my work for the day...Thanks!
– Colin Adams
Jul 25 '16 at 16:36
...
how to make a whole row in a table clickable as a link?
...
Now try to apply dataTables plugin to this one! :)
– Afonso Gomes
Nov 5 '14 at 15:22
7
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Build the full path filename in Python
... + filename_suffix)
Keep in mind that os.path.join() exists only because different operating systems use different path separator characters. It smooths over that difference so cross-platform code doesn't have to be cluttered with special cases for each OS. There is no need to do this for file name...
Draw text in OpenGL ES
...ently developing a small OpenGL game for the Android platform and I wonder if there's an easy way to render text on top of the rendered frame (like a HUD with the player´s score etc). The text would need to use a custom font also.
...
jQuery: Select data attributes that aren't empty?
...18) (mar'19) (may'20)...
Answer that works with:
Empty strings:
If the attr must exist & could have any value (or none at all)
jQuery("[href]");
Missing attributes:
If attr could exist & if exist, must have some value
jQuery("[href!='']");
Or both:
...
Modify UIImage renderingMode from a storyboard/xib file
... answered May 12 '14 at 17:31
SnowmanSnowman
28.7k4343 gold badges161161 silver badges284284 bronze badges
...
Regular expression for a string that does not start with a sequence
... @balabaster: I don’t think he’s looking for empty strings. But if so, he can easily change that by replacing the .+ by .*
– Gumbo
May 22 '09 at 19:07
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