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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() {
...
Or versus OrElse
...ocals init ([0] object a,
[1] int32 b,
[2] bool CS$4$0000)
IL_0000: nop
IL_0001: ldnull
IL_0002: stloc.0
IL_0003: ldc.i4.3
IL_0004: stloc.1
IL_0005: ldloc.0
IL_0006: ldnull
IL_0007: ceq
IL_0009: ldloc.0
IL_000a: callvirt instance string...
Is 23,148,855,308,184,500 a magic number, or sheer chance?
...
Add the cents to the number and you get 2314885530818450000, which in hexadecimal is 2020 2020 2020 1250.
Do you see the pattern? The first six bytes have been overwritten by spaces (hex 20, dec 32).
sha...
The performance impact of using instanceof in Java
... an instanceof, but the difference my quick test found was 10-20ms over 10,000,000 iterations. If "object" isn't an ObjT, though, catching the exception was over 3000x slower - over 31,000ms vs ~10ms for the instanceof.
– Steve
Feb 18 '12 at 0:27
...
What is the colon operator in Ruby?
...e some of the things mentioned in the answers:
require 'benchmark'
n = 1_000_000
print '"foo".equal? "foo" -> ', ("foo".equal? "foo"), "\n"
print '"foo" == "foo" -> ', ("foo" == "foo" ), "\n"
print ':foo.equal? :foo -> ', (:foo.equal? :foo ), "\n"
print ':foo == :foo ->...
Managing CSS Explosion
...in: 0;
font-size: 11px;
}
...
#some .selector {
border: 1px solid #000;
margin: 0;
}
Avoid using TAGs as selectors, when you can use id/classes
First off the DIV and SPAN tags are the exception: you should never use them, ever! ;) Only use them to attach a class/id.
This...
div#answ...
两种js滑动门(tab切换)效果 - 源码下载 - 清泛网 - 专注C/C++及内核技术
...种js滑动门效果</title>
<style type="text/css">
body{
color: #000;
font-family: "宋体", arial;
font-size: 12px;
background: #fff;
text-align: center;
margin: 0;
}
.nTab{
float: left;
width: 960px;
margin: 0 auto;
border-bottom:1px #AACCEE solid;
background:#d5d5d...
Virtual Memory Usage from Java under Linux, too much memory used
... over 100 lines long, and it's not unusual to have a thousand-line list.
0000000040000000 36K r-x-- /usr/local/java/jdk-1.6-x64/bin/java
0000000040108000 8K rwx-- /usr/local/java/jdk-1.6-x64/bin/java
0000000040eba000 676K rwx-- [ anon ]
00000006fae00000 21248K rwx-- [ anon ]
0...
Android SDK on a 64-bit linux machine
...m-tools$ ldd adb
linux-gate.so.1 => (0xf77bb000)
librt.so.1 => /lib/i386-linux-gnu/i686/cmov/librt.so.1 (0xf779b000)
libncurses.so.5 => not found
libpthread.so.0 => /lib/i386-linux-gnu/i686/cmov/libpthread.so.0 (0xf7781000)
libstdc++.so.6 =>...
How do I get class name in PHP?
...------- ------------ -------------- -------------
testExplode : [10,000 ] [0.0000020221710] [494,518.01547]
testSubstring : [10,000 ] [0.0000017177343] [582,162.19968]
testReflection: [10,000 ] [0.0000015984058] [625,623.34059]
...