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What is the benefit of using $() instead of backticks in shell scripts?
..."x is `sed ... <<<\"$y\"`"
or writing something like:
IPs_inna_string=`awk "/\`cat /etc/myname\`/"'{print $1}' /etc/hosts`
because $() uses an entirely new context for quoting
which is not portable as Bourne and Korn shells would require these backslashes, while Bash and dash don't.
S...
When should I use a struct instead of a class?
....X = x;
this.Y = y;
this.Z = z;
}
public override string ToString()
{
return "(X=" + this.X + ", Y=" + this.Y + ", Z=" + this.Z + ")";
}
public override int GetHashCode()
{
return (this.X + 2) ^ (this.Y + 2) ^ (this.Z + 2);
}
public ...
What is the difference between instanceof and Class.isAssignableFrom(…)?
...A.class.isAssignableFrom(b.getClass());
}
public static void main(String[] args) throws RunnerException {
Options opt = new OptionsBuilder()
.include(TestPerf2.class.getSimpleName())
.warmupIterations(20)
.measurementIterations(2000)
...
Check a collection size with JSTL
...urns the number of items in a collection, or the number of characters in a string.
Put this at the top of JSP page to allow the fn namespace:
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
Or if you're using JSPX or Facelets:
<... xmlns:fn="http://java.sun.com/jsp/...
Real differences between “java -server” and “java -client”?
... public LoopTest() {
super();
}
public static void main(String[] args) {
long start = System.currentTimeMillis();
spendTime();
long end = System.currentTimeMillis();
System.out.println("Time spent: "+ (end-start));
LoopTest loopTest = new L...
How to get the date from jQuery UI datepicker
...er").datepicker({
onSelect: function(dateText, inst) {
var dateAsString = dateText; //the first parameter of this function
var dateAsObject = $(this).datepicker( 'getDate' ); //the getDate method
}
});
The first parameter is in this case the selected Date as String. Use parseDat...
What is a “slug” in Django?
.... Slugs are commonly save with the respective content and it pass as a URL string.
Slug can create using SlugField
Ex:
class Article(models.Model):
title = models.CharField(max_length=100)
slug = models.SlugField(max_length=100)
If you want to use title as slug, django has a simple func...
MySQL: how to get the difference between two timestamps in seconds
...unction returns the internal timestamp value directly, with no implicit “string-to-Unix-timestamp” conversion.
Keep in mind that TIMEDIFF() return data type of TIME. TIME values may range from '-838:59:59' to '838:59:59' (roughly 34.96 days)
...
Generating CSV file for Excel, how to have a newline inside a value
...w has EFBBBF header, uses 0A as row separator, and 0D0A as new line inside strings in text cells.
– quetzalcoatl
Jan 7 '15 at 12:01
...
How to get a reference to a module inside the module itself?
... (at least) for a function, the __module__ property is not a module, but a string; thus a inspect.getabsfile(func.__module__) fails with "TypeError: 'os' is not a module, class, method, function, traceback, frame, or code object"; while inspect.getabsfile(sys.modules[o.__module__]) seems to pass.
...