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java.util.regex - importance of Pattern.compile()?
...e() {
var before = Instant.now();
for (int i = 0; i < 1_000_000; i++) {
Pattern.compile("ab").matcher("abcde").matches();
}
System.out.println("recompile " + Duration.between(before, Instant.now()));
}
@Test
public void compileOnce() {
...
C# 'is' operator performance
...just so you know, there is very little difference between the two, over 10,000,000 iterations
The enum check comes in at 700
milliseconds (approx)
The IS check comes in at 1000
milliseconds (approx)
I personally wouldn't fix this problem this way, but if I was forced to pick one method it would...
Convert hex color value ( #ffffff ) to integer value
...eiving hex color values from a server (in this form, #xxxxxx , example #000000 for black)
9 Answers
...
Generate random string/characters in JavaScript
...aracters, you can expect to see a duplicate after generating only about 50,000 strings, due to the birthday paradox. (sqrt(36^6) = 46656)
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What really happens in a try { return x; } finally { x = null; } statement?
...() cil managed
{
.maxstack 1
.locals init (
[0] int32 CS$1$0000)
L_0000: call int32 Program::SomeNumber()
L_0005: stloc.0
L_0006: leave.s L_000e
L_0008: call void Program::Foo()
L_000d: endfinally
L_000e: ldloc.0
L_000f: ret
.try L_0000 to L_0008 f...
Should a return statement be inside or outside a lock?
...() cil managed
{
.maxstack 2
.locals init (
[0] int32 CS$1$0000,
[1] object CS$2$0001)
L_0000: ldsfld object Program::sync
L_0005: dup
L_0006: stloc.1
L_0007: call void [mscorlib]System.Threading.Monitor::Enter(object)
L_000c: call int32 Program::GetValu...
Difference between declaring variables before or in loop?
...like that to be done. I ran this test around 10 times on my machine for 50,000,000-100,000,000 iterations with almost an identical piece of code (that I would love to share with anyone who wants to run stats). The answers were split almost equally either way usually by a margin of 900ms (over 50M it...
Which is faster: multiple single INSERTs or one multiple-row INSERT?
... insert at a time using single insert statement. is it allow me to insert 10000 rows at a time?
– Naresh Ramoliya
Apr 30 '16 at 8:02
10
...
How can I determine if a String is non-null and not only whitespace in Groovy?
...ss.getNotBlank = { !delegate.allWhitespace }
which let's you do:
groovy:000> foo = ''
===>
groovy:000> foo.notBlank
===> false
groovy:000> foo = 'foo'
===> foo
groovy:000> foo.notBlank
===> true
...
JavaScript function to add X months to a date
... 28 2016 18:00:00 GMT-0600 (CST)
> d.toISOString()
"2016-03-29T00:00:00.000Z"
Update for non-UTC dates: (by A.Hatchkins)
function addMonths (date, count) {
if (date && count) {
var m, d = (date = new Date(+date)).getDate()
date.setMonth(date.getMonth() + count, 1)
m = da...