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How to show popup message like in Stack Overflow
...i).fadeIn("fast");
setTimeout(i, (f ? Math.max(2500, h.length * 40) : 1000 * 30))
}
css
.error-notification{z-index:1;cursor:pointer;display:none;position:absolute;padding:15px;-moz-box-shadow:2px 2px 5px #000;-webkit-box-shadow:2px 2px 5px #000;box-shadow:2px 2px 5px #000;}
.error-notificati...
How do I write a short literal in C++?
... you trace one of the suffixes, you'll see that e.g. ""ui8 is defined as '\000', which is essentially '\0'.
– Nikita
Jan 28 '17 at 19:03
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PDO Prepared Inserts multiple rows in single query
...y slow. My test file to create the $data array has 28 cols and is about 80,000 lines. The final script took 41s to complete.
Using array_push() to create $insert_values instead of array_merge() resulted in a 100X speed up with execution time of 0.41s.
The problematic array_merge():
$insert_values...
DateTime2 vs DateTime in SQL Server
... specific instant in time, not a time zone.
– Suncat2000
Jun 1 '17 at 12:51
6
@Porad: What exactl...
In Python how should I test if a variable is None, True or False
... == 1) == True
38.1 ns ± 0.116 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
In [2]: %timeit (1 == 1) is True
33.7 ns ± 0.141 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
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...
MySQL: Large VARCHAR vs. TEXT?
... message text as either VARCHAR or TEXT. I'm setting a front-end limit of 3000 characters which means the messages would never be inserted into the db as longer than this.
...
MFC CString::Format()函数详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...浮点数，
Format("this is %e",-2.22);
返回的是：this is -2.220000E+000
等一下再说明如果将数的精度缩小
g 这个只能对应浮点型，且它会将值中多余的数去掉
Format("this is %g",02.200);
返回的是：this is 2.2
n 只能对应浮点型，...
How is null + true a string?
...ng str = null + true;
it's as bellow:
.locals init ([0] string str)
IL_0000: nop
IL_0001: ldc.i4.1
IL_0002: box [mscorlib]System.Boolean
IL_0007: call string [mscorlib]System.String::Concat(object)
IL_000c: stloc.0
...
Why can't (or doesn't) the compiler optimize a predictable addition loop into a multiplication?
...arraySize; ++c)
if (data[c] >= 128)
for (int i = 0; i < 100000; ++i)
sum += data[c];
into
for (int c = 0; c < arraySize; ++c)
if (data[c] >= 128)
sum += 100000 * data[c];
because the latter could lead to overflow of signed integers where the forme...
adding multiple entries to a HashMap at once in one statement
...6) as follow:
Map<String, Integer> cities = Map.of("Brussels", 1_139000, "Cardiff", 341_000);
The var-args case for Map is a little bit harder, you need to have both keys and values, but in Java, methods can’t have two var-args parameters. So the general case is handled by taking a var-ar...