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How to check if hex color is “too black”?
...e darkness of a color chosen by a color picker to see if it's "too black", and if so, set it to white. I thought I could use the first characters of the hex value to pull this off. It's working, but it's switching some legitimately "light" colors too.
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Why covariance and contravariance do not support value type
...or not.
You might want to read Eric Lippert's blog post on representation and identity for more on this topic in general.
EDIT: Having reread Eric's blog post myself, it's at least as much about identity as representation, although the two are linked. In particular:
This is why covariant and ...
What's the difference between fill_parent and wrap_content?
In Android, when layout out widgets, what's the difference between fill_parent ( match_parent in API Level 8 and higher) and wrap_content ?
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PDO mysql: How to know if insert was successful
I'm using PDO to insert a record (mysql and php)
7 Answers
7
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What are the mechanics of short string optimization in libc++?
...word) == sizeof(void*). You have correctly dissected the long/short flag, and the size field in the short form.
what value would __min_cap, the capacity of short strings, take for different architectures?
In the short form, there are 3 words to work with:
1 bit goes to the long/short flag.
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How to reverse a string in Go?
...w they force you to think about encodings.
– György Andrasek
Nov 18 '09 at 9:46
10
off-topic: wh...
django unit tests without a db
... db? I want to test business logic which doesn't require the db to set up. And while it is fast to setup a db, I really don't need it in some situations.
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Java string to date conversion
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That's the hard way, and those java.util.Date setter methods have been deprecated since Java 1.1 (1997). Simply format the date using SimpleDateFormat using a format pattern matching the input string.
In your specific case of "January 2, 2010" as...
How do I auto-hide placeholder text upon focus using css or jquery?
...input type="text" placeholder="Type something here!">
Firefox 15 and IE 10+ also supports this now. To expand on Casey Chu's CSS solution:
input:focus::-webkit-input-placeholder { color:transparent; }
input:focus:-moz-placeholder { color:transparent; } /* FF 4-18 */
input:focus::-moz-plac...
Difference between array_push() and $array[] =
... as PHP has to look up the function reference, find its position in memory and execute whatever code it defines.
Using $arr[] = 'some value'; does not require a function call, and implements the addition straight into the data structure. Thus, when adding a lot of data it is a lot quicker and resou...